• Tjernlund RB10 Register Booster Fan, Fits 4" x 10" Register, Brown
  • Tjernlund RB10 Register Booster Fan, Fits 4" x 10" Register, Brown
Tjernlund RB10 Register Booster Fan, Fits 4" x 10" Register, Brown
Tjernlund RB10 Register Booster Fan, Fits 4" x 10" Register, Brown

Tjernlund RB10 Register Booster Fan, Fits 4" x 10" Register, Brown

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MRP: €165,00
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€274,00
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  • Easy-to-install fan is 50% quieter than prop-style fans
  • Blower wheel is screened to protect small fingers and block debris
  • Plugs into standard 120V outlet
  • Includes paintable commercial-grade grill and 6-ft. power cord
  • 75 CFM, Made in USA

Customer Reviews

Quiet and works very well - 1 year old room I purchased this for my 1 year olds room which is on the oppisite corner of the hosue from where the furnance is and has three exterior walls. We could see the the temp on the baby monitor and as he's too young to use blankets efficiently, we needed his room to stay warm. On cold nights the temp would drop to low 60s high 50s and we would end up putting a space heater in there with the cord running under the door attached to an extension cord which we would unplug or plug in. Our options, after numerous HVAC reviews were a new furnance with a larger blower, or redo and optimize the duct work. Both were very expensive options. For a $100 this has more or less solved that issue.It sounds like a very quiet sound maker which is fine for us and he has a proper sound maker anyway so it's no big deal. The only con I'd say, espeically in our case is the power supply cord. Not the best visually and he sees it an wants to pull it out of the vent so we had to block it off with a few extra gates.Very happy with this product. 5Great boost in airflow. Some points to consider before buying.I bought two of these units to boost airflow in two areas of my home that are quite far from the main furnace and get little cooling/heating airflow. I had previously used another duct booster brand that sat on top of the grate and turned on/off automatically based on the temp of the air from the duct. Those units were really noisy and the airflow was just slight better than just the regular, non-boosted airflow. Didn't really feel much of a temp difference in the rooms. Plus, they died after a couple years of use.This airflow booster unit is quite different. It uses a squirrel cage fan instead of the circular fan found in most other units. The squirrel cage fan creates a lot of airflow. The whole unit also mounts inside the duct outlet so is hidden from view except for the power cord which is very nice from an aesthetic point-of-view. It is quieter than the above-the-grate models, too.These duct boosters really made a temperature difference in the rooms where they are used, particularly in cooling. I could never get the temps below 78-80 degrees F in those rooms during hot days no matter how low I set the thermostat. With these boosters, I got temps down to the thermostat setting which is such a relief in the summer. That made the cost of these units worth it (and in spite of the minor problems. More on those later.).Installation is a snap, too. Just drops in the existing 4x10 inch duct opening. Plug in the cord, turn on the switch and you're up-and-running. That is, if everything is just right - the proper opening size, close-by power outlet, no blockages in the duct opening itself. If all of those conditions exist for you, you will have no problems (other than some airflow noise which may or may not bother you). Otherwise, read on.Besides having the perfect duct opening, there are a few other things you should know about. First and foremost is this unit does not sense temperature to turn itself on and off. In fact, it has no "smarts" whatsoever. It's merely a fan that fits in the vent opening with an on/off switch that controls fan motor. It's either always running or off. Air will flow through it when it's off, but at a greatly reduce rate because of the size of the unit. That's not entirely bad for me. since I normally leave the furnace fan on continuously in very cold or very hot weather to even out temperatures throughout the house. This booster allows me to leave the furnace fan on "auto" since these booster does the job of the furnace fan and, in doing so, saves wear-and-tear on that furnace fan. However, while these boosters are quieter than the above-the-floor units, they are not completely silent when running so you definitely know when they're on. It's not motor noise, though, it's the sound of the rushing of air from the high airflow. That can't be avoided.As for the perfect opening, this booster is fairly bulky (see photos). When properly installed, the entire unit sit quite deeply in the duct opening flush with the floor (wall). You should check the clearance inside your duct outlet below the grate opening before buying this booster. I did not do this and I could not get the unit to fit flush in one the ducts where I was planning to use it. The ductwork opening must be no smaller 4" x 10" for this model (it fits quite precisely in that opening). If there any bends or narrowing of the ductwork inside the duct opening, they may block this unit from fitting flush with the floor or wall. For this booster to drop in cleanly, there must be at least a clean 4" drop into the ductwork for the unit to fit flush. Also, if there is a bend in the ductwork where the main ductwork meets the ductwork outlet (in the floor or wall), the fan opening of the booster must face the opening side of the bend (i.e. not blocked by the metal side of the bend), otherwise the airflow will be blocked. Again, if there any kinks, bends, or narrowing of the ductwork, they may prevent this unit from facing the right direction as well since the motor end of this unit is larger than the other end.As for the grate cover, you must use the grate that is supplied with the kit (see photo). There is less than 1/2" of drop for a grate cover to fit inside the booster face, so normal grate covers won't work. Plus, there has to an opening where the power plug has to go through and for access to the on/off switch. Sadly, I had some nice, decorative covers that I can't use anymore (too deep and they blocked the cord). The grate you get in the kit is a plain, brownish-tan, finned cover. It doesn't fit completely flush, either, and sits about 1/16-1/8 inch off the floor (or wall) when it's in place (see photo). It also fits loosely in the opening without any fasteners which is fine if this unit is on the floor, but if you're wall-mounting this booster, you'll have to figure out how to make that grate stay on the wall. Their grate does allow the cord to plug into the power socket on the booster and the on/off switch is easy to get to.Speaking of the power cord, it plugs in through the front of the grate into a port on the unit (see photo). Unless you hardwire beneath the ductwork somehow (if you are a handy person), you will have a black cord extending quite conspicuously out the grating. Power-wise, it requires 110-120VAC. Fortunately for me, I happen to have wall outlets near my ducts, so it was easy to find power. If you don't have such an outlet, then you'll need to use extension cords or something, to get power to the unit.In summary:Pros:- Great airflow- Relatively quiet (compare to other units)- Significantly boosts airflow in needed areas.- Hidden (mostly)- Easy to install- Well built, all metal constructionCons:- No automatic temp sense to turn unit on and off.- Totally manual on/off, i.e., always on or always off.- Bulky, requires correctly sized opening to fit properly- Not completely silent in operation (airflow noise)- Cord stands out of the unit when plugged in- Can't use custom grate covers- ExpensiveIf I have any more feedback as I use this product over the seasons, I will report back.[UPDATE 5/19/2017] Well, it's been two years since I installed these units and they're still running as good as ever. Never had a failure. I have them running on wall timers (the kind that plug in the wall socket) to turn them on and off at appropriate times (I have them shut off during overnight hours). When the weather is really hot or cold, I let them run continuously, 24/7, non-stop. And they do, without failure.They are far better than any above-the-grate booster that dies after a season or two.I did discover a slight glitch with the power cord. The end that plugs into the blower fits very loosely into the socket in the blower. Just a slight touch will knock it free enough to cut power, shutting off the blower. This could happen for any number of reasons such as vacuuming. Even the slightest nudge will break the connection. I've discovered on numerous occasions that I had unknowingly knocked the cord and cut the power off. You can't tell from a distance because the cord is still standing up in the grate and looks fine. I could tell the blower was off because of change in room temp. I've tried to use electrical tape to hold the cord to the blower, but it's not an elegant solution. I wish the cord had a firmer connection to the blower.Still, both blowers have run like champs since day one, for two years now. Much better life expectancy than I expected. They still make a world of difference in temps in my home.4Very quiet and significantly reduced temps -- may require a break-in period though This booster dramatically improved airflow in the ducting of a bedroom and the room is now significantly cooler as a result. I did have an issue during installation though. After I finished installing it I powered it on and the fan had an incredibly annoying whine. Fortunately, after about fifteen minutes of use the whine has gone completely away and now all I hear is a very quiet fan noise. In fact, I can't even hear it when I run my -- also very quiet -- ceiling fan. The only suggestion I'd make is to buy either an outlet programmer or remote control for it, otherwise it will run 24/7. I personally went the remote route and I couldn't be happier.I decided to go with this register booster (and pay a significant premium in this process) due to the fact it uses a squirrel cage design. The cheaper boosters seem to all use PC fans. While this booster might seem expensive compared to the other boosters, it should be noted that the PC fan one's will likely be very noisy with the stock fans. It would be possible to modify the cheaper boosters with some high-end quiet 120MM fans but good luck ever getting a comparable CFM at a similar decibel level to the squirrel cage fan design. 5It works!!!Ok I m not going to lie here....I was worried about buying this. We just moved into a new home and my teenage sons room is on the top floor in the corner at the end of the vent...With the summer we have been having here in Chicago, I got nervous when he told me it was hot in his room the first night in our new home. I went in there the second day and was bummed that it was so warm and the air conditioning wasn t blowing out of his vent like the rest of the house. He decided to sleep in our basement until we could figure out what to do. We didn t want to do an in window ac unit and tried a mobile ac unit that just blew warm air around the room. I was searching on Amazon and saw this and read the reviews and then checked out some similar items and read those reviews and then had it along with a couple other brands in my cart for like a week. I finally decided to just try it and I am so glad I did!! His room feels like the rest of the house!! It s not warm at all anymore! It was so easy to install. I did read in the reviews to make sure you had 4 inches down into the vent as that is how deep the fan is and I also read to put a timer on it as otherwise you have to reach into the vent and manually turn it off as otherwise it runs nonstop. I had an adapter with a remote for my outside Halloween lights that I used instead of the timer so when my son leaves his room for college he can just hit the remote and shut it off and then when he gets home from college or work he can hit the remote and turn it back on and he doesn t have to have set times when it goes on and off like on a timer. This saved us from buying another ac unit as we seriously were considering going to a dual unit yet it was only his room that was warm out of our entire 3,100 square foot home. You will not be disappointed in this! Not sure about the winter yet but my son actually likes it cool in his room even in the winter so not sure if it will even be used then.5Powerful! Better than expected!I have tried two other boosters which did not perform as well. I did however have a problem. My vent hole is slanted on the inside and is only 2 inches deep on the one side. The motor sits down close to 4 inches. So I built a frame using 3/4 inch plywood which raised the mounting surface 2.5 inches. The other problem was that I don't want to have to turn it on and off. So I bought a 24 hour analog timer and set it to run from 9 PM until 6 AM. Being upstairs, we would have trouble sleeping due to the heat.The motor is powerful and creates great white noise for sleeping. Even when the Air Conditioning is not running it pulls cool air from the basement. This allows me to adjust the thermostat 3 or 4 degrees higher to save money. The result? The the upstairs is cooler and the basement is warmer. Perfect!Love it.5What was expected, and moreI purchased this unit to fit a 4x10 register in an upstairs bedroom that tends to get very hot during the day because of its orientation, combined with fairly low ventilation output from the forced air system. We normally play the game of closing registers downstairs to have more air go upstairs during the summer months, but that never quite helped this bedroom.The register booster is a heavy unit, packaged in a large box. I was impressed with fit and build and the bearings used for the fan and motor assembly. Let's just say there is a marked difference in quality with the other type of fan I've replaced in bathroom ceilings. This booster just looks professional and certainly the build seems to fit the price (compared to very expensive bathroom exhaust fans I've installed - as expensive or more - that are an engineering abomination).The install was trivial, just removing the old register, placing the unit in, placing its cover, and connecting the power. The main unit has sharp edges because it's cut sheet metal, the cover itself is solid well finished. The unit comes with its own register cover so the old one cannot be used. The on/off switch is front right under the register accessible from through the cover, and easy to get to with fingers. There's a plastic grid on top of the fan to keep fingers away and preventing items from falling through. There is no grid at all around the base of the unit. You don't want anyone pulling the unit up when it's running because the fan blades are very sharp. The unit can be screwed in to prevent that from happening.The metal drum fan is very quiet for the airflow this generates. The white noise level is very low and can be completely ignored for sleep purposes. A problem though, depending on how well fitted the air duct is to the floor: you may get a vibration if the metal enclosure of the booster happens to touch the air duct, and the duct isn't secured to the floor. This causes a very annoying vibration that is amplified by the air duct. This was a problem at first for me because whoever installed the duct in my house didn't quite understand what a "quality finish or fit" was, so a few screws and not so gentle hammer hits on the duct solved that issue. This isn't a problem with the booster at all, but because it fits perfectly and will use all of the 4x10 space exactly, it's the problem of shoddy work by our HVAC installer. So be ready to put either tape of foam insulation to avoid metal to metal contact to avoid any resonance/vibration issues. I note that the unit sits on carpet so effectively is vibration free. Not sure what that would do on hardwood or other hard surface but a line of weather strip would fix that quickly if needed.The room is very much cooler, about 5 degrees or so and in-line with the other bedrooms now, so job well done.It would be nice to have the unit be temperature sensitive so it can turn itself on/off, but certainly this is not a big deal. We keep our main blower on all day long because we found it actually saves on energy by circulating air even when the A/C (or heat) isn't, on so having the booster on all the time isn't a problem for us.The good news is that the booster replaces a very ugly and noisy box fan previously necessary to make the room comfortable, and the booster is very effective compared to that.Just be sure to measure the register and figure out if you need the 4x10 or 4x12 model, but definitely would buy again if the need comes up.5Great airflow while it worked.Worked incredibly well, until it abruptly stopped working 9 months later, with the smell of electrical smoke hinting at the cause of its demise. It tripped the circuit breaker when it failed.2Improves Air flow, but volume is what you want, not velocity.At first I was very skeptical. I have 1 bedroom, southwest corner of the 2nd floor of my house, which is at least 3 degrees hotter than any other room. There are so many variables why this might be. Added film to my windows, got a quote on more attic insulation, spray foamed some of the walls. And after all that...Its still 3 degrees hotter on any given day.So, I came to the conclusion that i need more cool air. The unit is pretty well built. The grate is heavy duty. Its all flush with the floor, which is great for my son's room. The unit is not silent. Sounds like a fan is going in his room. All things considered its not bad.I purchased a HOLDPEAK 866B Digital Anemometer to validate that this unit was more CFM's(volume) then my existing vent. The existing vent puts out 433FPM(144CFM), this unit is over 720FPM(240CFM), using an 4x12 floor grate. The unit states 85CFM, thats probably because the actual opening is much smaller then my 4x12 Meaning...it doesn't produce as much volume even though velocity is higher? It is putting out a higher velocity of air and it also runs 24/7. As for volume of air...I'm not 100% sure because of the smaller opening and a larger opening means more volume in a shorter period of time.The proof however is the temperature of the room, because math can be deceiving (even though its the only subject with a right answer, sorry Philosophy). Because the fan is running 24/7, it is bringing up more air into the second floor than a fan that only runs some of the time. Its cheaper to operate this one fan vs. my entire furnace 24/7, and so that room does see cooler temperatures.As for 3 degree's cooler, well that depends on how hot the outside is. If its cooler outside, this fan keeps up, if its crazy hot, it still cools the room, but can't match some of my rooms with 2 4x12 openings.In the end, I'm keeping it. It does reduce temperature by bringing air from the main trunk. I could use another fan to pump basement air into the trunk 24/7 or use a smart switch to pump air when the furnace turns off. I could hire an HVAC guy to add a line $$$, I could add that attic insulation, which is probably the best idea.Long story longer, if you think you can pull cold air thru that vent 100% of the time, or have lower than 85CFMs in your existing vent...probably going to improve your air flow.4JunkI purchased two for a second floor room with two vents to help with heating and cooling. I installed both. There was little discernible change in the temperature of the room. The sheet metal construction with sharp edges is of poor quality and will cut the installer if not careful. Not recommended.1Cools warm air ,loud, and no variable speed adjustment Overall it should only be advertised for use with cool air. The blower itself is well constructed but cools any warm air passing through it totally defeating its purpose. Also there are no pre-drilled holes should you wish to mount it as a wall mounted exchange. The instructions actually tell you to drill the holes yourself. Which I would guess voids the warranty. A pre drilled hole with a cap would be nice and give you the option to floor or wall mount it. Another problem I have is with the way the AC cord is designed. You have to plug it in through a slot in the vent. The power cord is then very unsightly which basically hangs out the front of the unit. The power switch is behind the grill and hard to get at. Aesthetically and functionally could use some very basic redesigning. 2LISTEN TO THE WHINE ON THE VIDEO AND YOU DECIDE Be aware that this unit has a high pitch whine to it that, in my case, has never gone away. I ve had mine installed for two years and use it regularly. It s great for pulling cool air up from the basement but I have one in my TV room, and I like to turn my TV up pretty loud, and I can still hear the whine over the TV. It has two whine levels. If the central air isn t blowing and it is just the unit blowing air, the whine is one level, but when the central air kicks in and the unit cranks up faster, the whine decibel level goes up and you can hear it winding up as it does it. And I don t think it is air noise like some reviews claim because when I go outside in the wind, I don t hear a whine like I do when this unit is turning. So it must be motor noise. It does work well, I just wish they would do something about the whine.........obviously.1So loud that it does not matter if it works or not.This product *may* work. It seems like it was blowing warm air after I plugged it in. I don't really know if it was blowing more warm air or not, because I had to unplug it to prevent permanent hearing loss. It is LOUD - in a really annoying, screachy kind of way. I bought it for my office and and simply cannot use it.EDIT: although advertised as having "whisper quiet operation" it clearly does not. I submitted a return request, and the seller is only offering a return subject to me paying return shipping AND a restocking fee of sixteen ninety-nine. Learn from my mistakes.1Too deep for my duct. So far this seems to be working to help pull some A/C to the furthest bedroom. The micro power switch is loose, but minor. The real issues is my duct is the last duct on a run, so it angles upward and isn't deep enough for the unit to sit all the way down in the duct. My fault for not double checking depth. Great idea, if they brought the squirrel cage fans to the surface they would be onto something. It has a little noise as others are saying but not bad. It will be hot soon and it will be put to the test. I may have to pull this unit and install in another bedroom and get one of the surface mou t type with the computer fans. 4Not worth the money.Worked "OK" for about 3 months, then died.2
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Customer Reviews

Quiet and works very well - 1 year old room I purchased this for my 1 year olds room which is on the oppisite corner of the hosue from where the furnance is and has three exterior walls. We could see the the temp on the baby monitor and as he's too young to use blankets efficiently, we needed his room to stay warm. On cold nights the temp would drop to low 60s high 50s and we would end up putting a space heater in there with the cord running under the door attached to an extension cord which we would unplug or plug in. Our options, after numerous HVAC reviews were a new furnance with a larger blower, or redo and optimize the duct work. Both were very expensive options. For a $100 this has more or less solved that issue.It sounds like a very quiet sound maker which is fine for us and he has a proper sound maker anyway so it's no big deal. The only con I'd say, espeically in our case is the power supply cord. Not the best visually and he sees it an wants to pull it out of the vent so we had to block it off with a few extra gates.Very happy with this product. 5Great boost in airflow. Some points to consider before buying.I bought two of these units to boost airflow in two areas of my home that are quite far from the main furnace and get little cooling/heating airflow. I had previously used another duct booster brand that sat on top of the grate and turned on/off automatically based on the temp of the air from the duct. Those units were really noisy and the airflow was just slight better than just the regular, non-boosted airflow. Didn't really feel much of a temp difference in the rooms. Plus, they died after a couple years of use.This airflow booster unit is quite different. It uses a squirrel cage fan instead of the circular fan found in most other units. The squirrel cage fan creates a lot of airflow. The whole unit also mounts inside the duct outlet so is hidden from view except for the power cord which is very nice from an aesthetic point-of-view. It is quieter than the above-the-grate models, too.These duct boosters really made a temperature difference in the rooms where they are used, particularly in cooling. I could never get the temps below 78-80 degrees F in those rooms during hot days no matter how low I set the thermostat. With these boosters, I got temps down to the thermostat setting which is such a relief in the summer. That made the cost of these units worth it (and in spite of the minor problems. More on those later.).Installation is a snap, too. Just drops in the existing 4x10 inch duct opening. Plug in the cord, turn on the switch and you're up-and-running. That is, if everything is just right - the proper opening size, close-by power outlet, no blockages in the duct opening itself. If all of those conditions exist for you, you will have no problems (other than some airflow noise which may or may not bother you). Otherwise, read on.Besides having the perfect duct opening, there are a few other things you should know about. First and foremost is this unit does not sense temperature to turn itself on and off. In fact, it has no "smarts" whatsoever. It's merely a fan that fits in the vent opening with an on/off switch that controls fan motor. It's either always running or off. Air will flow through it when it's off, but at a greatly reduce rate because of the size of the unit. That's not entirely bad for me. since I normally leave the furnace fan on continuously in very cold or very hot weather to even out temperatures throughout the house. This booster allows me to leave the furnace fan on "auto" since these booster does the job of the furnace fan and, in doing so, saves wear-and-tear on that furnace fan. However, while these boosters are quieter than the above-the-floor units, they are not completely silent when running so you definitely know when they're on. It's not motor noise, though, it's the sound of the rushing of air from the high airflow. That can't be avoided.As for the perfect opening, this booster is fairly bulky (see photos). When properly installed, the entire unit sit quite deeply in the duct opening flush with the floor (wall). You should check the clearance inside your duct outlet below the grate opening before buying this booster. I did not do this and I could not get the unit to fit flush in one the ducts where I was planning to use it. The ductwork opening must be no smaller 4" x 10" for this model (it fits quite precisely in that opening). If there any bends or narrowing of the ductwork inside the duct opening, they may block this unit from fitting flush with the floor or wall. For this booster to drop in cleanly, there must be at least a clean 4" drop into the ductwork for the unit to fit flush. Also, if there is a bend in the ductwork where the main ductwork meets the ductwork outlet (in the floor or wall), the fan opening of the booster must face the opening side of the bend (i.e. not blocked by the metal side of the bend), otherwise the airflow will be blocked. Again, if there any kinks, bends, or narrowing of the ductwork, they may prevent this unit from facing the right direction as well since the motor end of this unit is larger than the other end.As for the grate cover, you must use the grate that is supplied with the kit (see photo). There is less than 1/2" of drop for a grate cover to fit inside the booster face, so normal grate covers won't work. Plus, there has to an opening where the power plug has to go through and for access to the on/off switch. Sadly, I had some nice, decorative covers that I can't use anymore (too deep and they blocked the cord). The grate you get in the kit is a plain, brownish-tan, finned cover. It doesn't fit completely flush, either, and sits about 1/16-1/8 inch off the floor (or wall) when it's in place (see photo). It also fits loosely in the opening without any fasteners which is fine if this unit is on the floor, but if you're wall-mounting this booster, you'll have to figure out how to make that grate stay on the wall. Their grate does allow the cord to plug into the power socket on the booster and the on/off switch is easy to get to.Speaking of the power cord, it plugs in through the front of the grate into a port on the unit (see photo). Unless you hardwire beneath the ductwork somehow (if you are a handy person), you will have a black cord extending quite conspicuously out the grating. Power-wise, it requires 110-120VAC. Fortunately for me, I happen to have wall outlets near my ducts, so it was easy to find power. If you don't have such an outlet, then you'll need to use extension cords or something, to get power to the unit.In summary:Pros:- Great airflow- Relatively quiet (compare to other units)- Significantly boosts airflow in needed areas.- Hidden (mostly)- Easy to install- Well built, all metal constructionCons:- No automatic temp sense to turn unit on and off.- Totally manual on/off, i.e., always on or always off.- Bulky, requires correctly sized opening to fit properly- Not completely silent in operation (airflow noise)- Cord stands out of the unit when plugged in- Can't use custom grate covers- ExpensiveIf I have any more feedback as I use this product over the seasons, I will report back.[UPDATE 5/19/2017] Well, it's been two years since I installed these units and they're still running as good as ever. Never had a failure. I have them running on wall timers (the kind that plug in the wall socket) to turn them on and off at appropriate times (I have them shut off during overnight hours). When the weather is really hot or cold, I let them run continuously, 24/7, non-stop. And they do, without failure.They are far better than any above-the-grate booster that dies after a season or two.I did discover a slight glitch with the power cord. The end that plugs into the blower fits very loosely into the socket in the blower. Just a slight touch will knock it free enough to cut power, shutting off the blower. This could happen for any number of reasons such as vacuuming. Even the slightest nudge will break the connection. I've discovered on numerous occasions that I had unknowingly knocked the cord and cut the power off. You can't tell from a distance because the cord is still standing up in the grate and looks fine. I could tell the blower was off because of change in room temp. I've tried to use electrical tape to hold the cord to the blower, but it's not an elegant solution. I wish the cord had a firmer connection to the blower.Still, both blowers have run like champs since day one, for two years now. Much better life expectancy than I expected. They still make a world of difference in temps in my home.4Very quiet and significantly reduced temps -- may require a break-in period though This booster dramatically improved airflow in the ducting of a bedroom and the room is now significantly cooler as a result. I did have an issue during installation though. After I finished installing it I powered it on and the fan had an incredibly annoying whine. Fortunately, after about fifteen minutes of use the whine has gone completely away and now all I hear is a very quiet fan noise. In fact, I can't even hear it when I run my -- also very quiet -- ceiling fan. The only suggestion I'd make is to buy either an outlet programmer or remote control for it, otherwise it will run 24/7. I personally went the remote route and I couldn't be happier.I decided to go with this register booster (and pay a significant premium in this process) due to the fact it uses a squirrel cage design. The cheaper boosters seem to all use PC fans. While this booster might seem expensive compared to the other boosters, it should be noted that the PC fan one's will likely be very noisy with the stock fans. It would be possible to modify the cheaper boosters with some high-end quiet 120MM fans but good luck ever getting a comparable CFM at a similar decibel level to the squirrel cage fan design. 5It works!!!Ok I m not going to lie here....I was worried about buying this. We just moved into a new home and my teenage sons room is on the top floor in the corner at the end of the vent...With the summer we have been having here in Chicago, I got nervous when he told me it was hot in his room the first night in our new home. I went in there the second day and was bummed that it was so warm and the air conditioning wasn t blowing out of his vent like the rest of the house. He decided to sleep in our basement until we could figure out what to do. We didn t want to do an in window ac unit and tried a mobile ac unit that just blew warm air around the room. I was searching on Amazon and saw this and read the reviews and then checked out some similar items and read those reviews and then had it along with a couple other brands in my cart for like a week. I finally decided to just try it and I am so glad I did!! His room feels like the rest of the house!! It s not warm at all anymore! It was so easy to install. I did read in the reviews to make sure you had 4 inches down into the vent as that is how deep the fan is and I also read to put a timer on it as otherwise you have to reach into the vent and manually turn it off as otherwise it runs nonstop. I had an adapter with a remote for my outside Halloween lights that I used instead of the timer so when my son leaves his room for college he can just hit the remote and shut it off and then when he gets home from college or work he can hit the remote and turn it back on and he doesn t have to have set times when it goes on and off like on a timer. This saved us from buying another ac unit as we seriously were considering going to a dual unit yet it was only his room that was warm out of our entire 3,100 square foot home. You will not be disappointed in this! Not sure about the winter yet but my son actually likes it cool in his room even in the winter so not sure if it will even be used then.5Powerful! Better than expected!I have tried two other boosters which did not perform as well. I did however have a problem. My vent hole is slanted on the inside and is only 2 inches deep on the one side. The motor sits down close to 4 inches. So I built a frame using 3/4 inch plywood which raised the mounting surface 2.5 inches. The other problem was that I don't want to have to turn it on and off. So I bought a 24 hour analog timer and set it to run from 9 PM until 6 AM. Being upstairs, we would have trouble sleeping due to the heat.The motor is powerful and creates great white noise for sleeping. Even when the Air Conditioning is not running it pulls cool air from the basement. This allows me to adjust the thermostat 3 or 4 degrees higher to save money. The result? The the upstairs is cooler and the basement is warmer. Perfect!Love it.5What was expected, and moreI purchased this unit to fit a 4x10 register in an upstairs bedroom that tends to get very hot during the day because of its orientation, combined with fairly low ventilation output from the forced air system. We normally play the game of closing registers downstairs to have more air go upstairs during the summer months, but that never quite helped this bedroom.The register booster is a heavy unit, packaged in a large box. I was impressed with fit and build and the bearings used for the fan and motor assembly. Let's just say there is a marked difference in quality with the other type of fan I've replaced in bathroom ceilings. This booster just looks professional and certainly the build seems to fit the price (compared to very expensive bathroom exhaust fans I've installed - as expensive or more - that are an engineering abomination).The install was trivial, just removing the old register, placing the unit in, placing its cover, and connecting the power. The main unit has sharp edges because it's cut sheet metal, the cover itself is solid well finished. The unit comes with its own register cover so the old one cannot be used. The on/off switch is front right under the register accessible from through the cover, and easy to get to with fingers. There's a plastic grid on top of the fan to keep fingers away and preventing items from falling through. There is no grid at all around the base of the unit. You don't want anyone pulling the unit up when it's running because the fan blades are very sharp. The unit can be screwed in to prevent that from happening.The metal drum fan is very quiet for the airflow this generates. The white noise level is very low and can be completely ignored for sleep purposes. A problem though, depending on how well fitted the air duct is to the floor: you may get a vibration if the metal enclosure of the booster happens to touch the air duct, and the duct isn't secured to the floor. This causes a very annoying vibration that is amplified by the air duct. This was a problem at first for me because whoever installed the duct in my house didn't quite understand what a "quality finish or fit" was, so a few screws and not so gentle hammer hits on the duct solved that issue. This isn't a problem with the booster at all, but because it fits perfectly and will use all of the 4x10 space exactly, it's the problem of shoddy work by our HVAC installer. So be ready to put either tape of foam insulation to avoid metal to metal contact to avoid any resonance/vibration issues. I note that the unit sits on carpet so effectively is vibration free. Not sure what that would do on hardwood or other hard surface but a line of weather strip would fix that quickly if needed.The room is very much cooler, about 5 degrees or so and in-line with the other bedrooms now, so job well done.It would be nice to have the unit be temperature sensitive so it can turn itself on/off, but certainly this is not a big deal. We keep our main blower on all day long because we found it actually saves on energy by circulating air even when the A/C (or heat) isn't, on so having the booster on all the time isn't a problem for us.The good news is that the booster replaces a very ugly and noisy box fan previously necessary to make the room comfortable, and the booster is very effective compared to that.Just be sure to measure the register and figure out if you need the 4x10 or 4x12 model, but definitely would buy again if the need comes up.5Great airflow while it worked.Worked incredibly well, until it abruptly stopped working 9 months later, with the smell of electrical smoke hinting at the cause of its demise. It tripped the circuit breaker when it failed.2Improves Air flow, but volume is what you want, not velocity.At first I was very skeptical. I have 1 bedroom, southwest corner of the 2nd floor of my house, which is at least 3 degrees hotter than any other room. There are so many variables why this might be. Added film to my windows, got a quote on more attic insulation, spray foamed some of the walls. And after all that...Its still 3 degrees hotter on any given day.So, I came to the conclusion that i need more cool air. The unit is pretty well built. The grate is heavy duty. Its all flush with the floor, which is great for my son's room. The unit is not silent. Sounds like a fan is going in his room. All things considered its not bad.I purchased a HOLDPEAK 866B Digital Anemometer to validate that this unit was more CFM's(volume) then my existing vent. The existing vent puts out 433FPM(144CFM), this unit is over 720FPM(240CFM), using an 4x12 floor grate. The unit states 85CFM, thats probably because the actual opening is much smaller then my 4x12 Meaning...it doesn't produce as much volume even though velocity is higher? It is putting out a higher velocity of air and it also runs 24/7. As for volume of air...I'm not 100% sure because of the smaller opening and a larger opening means more volume in a shorter period of time.The proof however is the temperature of the room, because math can be deceiving (even though its the only subject with a right answer, sorry Philosophy). Because the fan is running 24/7, it is bringing up more air into the second floor than a fan that only runs some of the time. Its cheaper to operate this one fan vs. my entire furnace 24/7, and so that room does see cooler temperatures.As for 3 degree's cooler, well that depends on how hot the outside is. If its cooler outside, this fan keeps up, if its crazy hot, it still cools the room, but can't match some of my rooms with 2 4x12 openings.In the end, I'm keeping it. It does reduce temperature by bringing air from the main trunk. I could use another fan to pump basement air into the trunk 24/7 or use a smart switch to pump air when the furnace turns off. I could hire an HVAC guy to add a line $$$, I could add that attic insulation, which is probably the best idea.Long story longer, if you think you can pull cold air thru that vent 100% of the time, or have lower than 85CFMs in your existing vent...probably going to improve your air flow.4JunkI purchased two for a second floor room with two vents to help with heating and cooling. I installed both. There was little discernible change in the temperature of the room. The sheet metal construction with sharp edges is of poor quality and will cut the installer if not careful. Not recommended.1Cools warm air ,loud, and no variable speed adjustment Overall it should only be advertised for use with cool air. The blower itself is well constructed but cools any warm air passing through it totally defeating its purpose. Also there are no pre-drilled holes should you wish to mount it as a wall mounted exchange. The instructions actually tell you to drill the holes yourself. Which I would guess voids the warranty. A pre drilled hole with a cap would be nice and give you the option to floor or wall mount it. Another problem I have is with the way the AC cord is designed. You have to plug it in through a slot in the vent. The power cord is then very unsightly which basically hangs out the front of the unit. The power switch is behind the grill and hard to get at. Aesthetically and functionally could use some very basic redesigning. 2LISTEN TO THE WHINE ON THE VIDEO AND YOU DECIDE Be aware that this unit has a high pitch whine to it that, in my case, has never gone away. I ve had mine installed for two years and use it regularly. It s great for pulling cool air up from the basement but I have one in my TV room, and I like to turn my TV up pretty loud, and I can still hear the whine over the TV. It has two whine levels. If the central air isn t blowing and it is just the unit blowing air, the whine is one level, but when the central air kicks in and the unit cranks up faster, the whine decibel level goes up and you can hear it winding up as it does it. And I don t think it is air noise like some reviews claim because when I go outside in the wind, I don t hear a whine like I do when this unit is turning. So it must be motor noise. It does work well, I just wish they would do something about the whine.........obviously.1So loud that it does not matter if it works or not.This product *may* work. It seems like it was blowing warm air after I plugged it in. I don't really know if it was blowing more warm air or not, because I had to unplug it to prevent permanent hearing loss. It is LOUD - in a really annoying, screachy kind of way. I bought it for my office and and simply cannot use it.EDIT: although advertised as having "whisper quiet operation" it clearly does not. I submitted a return request, and the seller is only offering a return subject to me paying return shipping AND a restocking fee of sixteen ninety-nine. Learn from my mistakes.1Too deep for my duct. So far this seems to be working to help pull some A/C to the furthest bedroom. The micro power switch is loose, but minor. The real issues is my duct is the last duct on a run, so it angles upward and isn't deep enough for the unit to sit all the way down in the duct. My fault for not double checking depth. Great idea, if they brought the squirrel cage fans to the surface they would be onto something. It has a little noise as others are saying but not bad. It will be hot soon and it will be put to the test. I may have to pull this unit and install in another bedroom and get one of the surface mou t type with the computer fans. 4Not worth the money.Worked "OK" for about 3 months, then died.2
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