• Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
  • Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
  • Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
  • Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
  • Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
  • Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
  • Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)
Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)

Noctua Nf A14 Pwm, Premium Quiet Fan, 4 Pin (140mm, Brown)

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  • Award-winning 140x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
  • Square frame design is ideal for water cooling radiators (AIO or DIY), PC cases and other chassis (intake & exhaust), cabinet ventilation, etc.
  • 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, broad 300-1500rpm speed range (1200rpm max. with supplied Low-Noise Adaptor)
  • Includes anti-vibration mounts, fan screws, Low-Noise Adaptor, extension cable and y-cable for running two PWM fans on the same header
  • Trusted Noctua quality with premium-grade SSO2 bearing and more than 150.000 hours MTTF, backed up with 6-year manufacturer's warranty

Customer Reviews

The NF-A14 PWM is the best all-around 140mm fan in the world. The NF-A14 PWM is the best all-around 140mm fan in the world, even better than its more expensive brother, the iPPC variant.There are a few points that are worth knowing:1: Quiet. Like all tan and brown Noctua products, the NF-A14 PWM is borderline silent in almost all uses. The beauty of this is that it requires no knowledge, or specialized software/hardware, to get it to run appropriately. Simply plug it into a PWM-enabled fan header and let the computer run it. It'll be silent or near silent in almost all conditions.2: Powerful. This fan produces excellent pressure and airflow. Unlike the 120mm fan Noctua equivalents, the 140mm line is designed, in general, for all-around performance, so it works great on heat sinks/rads, intakes and exhausts.3: Position invariable. Almost all fans use sleeve bearings, which in a typical position, where the bearing is perpendicular to the ground (think front case fans), are both quiet and long lasting. However, when placed parallel to the ground (think your power supply fan), they can become noisy and fail prematurely. The SSO2 bearings in the NF-A14 PWM are unaffected by position, making these great for fans that are mounted at the very top of your case or radiator.4: Long lasting. In large due to those superior bearings, these fans will last much, much longer than your computer will be relevant. You will easily get 4 or 5 entire computer builds out of reusing these fans, and given that fan technology doesn't advance at the rate that other computer technology does, you could conceivably reuse the same fans for 10 years or even longer.All in all, the NF-A14 PWM is my favorite fan within Noctua, including their higher speed iPPCs (which I also own) and their smaller fans. 5Made in China made it worse for the same price. I bought so many fans and cooling solutions from Noctua and never been disappointed before.This is the third 140mm fan from Noctua that I bought, this time it arrived Made in China, which is a certain no for me.Although the fan does perform very well, there are a lot of cosmetic imperfections as a difference in color, uneven finish, rounded edges.They never advertised the product as Made in Taiwan or not Made in China, but when you are selling a product as a "Premium" one and the price certainly it is, they should never let their quality, performance nor cosmetic, go down, it is like buying a second tier Noctua products and they didn't even lower their prices.In the past, their fans were my first choice, it didn't matter the price, from now on, they will not be my first choice anymore.I will be looking for other brands for fans and cooling solutions. 2Significantly quieter, show up in fan control interfaces, but I had to make mounting adjustments. The back fan that was stock with the computer case ran sometime, sometime didn't...it was just about done. Plus, even though it was a four-pin fan and was powered by the motherboard, it wouldn't show up in either the motherboard's UEFI BIOS Utility, nor in a third party fan monitoring program. Thus, I couldn't monitor the fan, and didn't know if it was being controlled by the motherboard or not.So, I decided to replace it with this fan hopefully reducing fan noise and providing fan monitoring and control too. This fan comes with flexible, sound dampening mounts that are a great idea. They isolate the fan from the case. But I simply didn't have room in the case to pull those mounts through the case's mounting holes and then through the mounting holes of this fan. So, I had to resort to using the screws (included) to hold it in place.The case's top fan was still working. Here again, it was a 4-pin fan attached to the motherboard. But, it too wouldn't show up for monitoring purposes. So, I replaced it with Noctua NF-A20 PWM, Premium Quiet Fan, 4-Pin (200x200x30mm, Brown).However, I had a problem with this fan's overall size. The top of the computer case is removable, making replacing the fan an easy job. It was easy to push/pull the elastic mounts through the fan mounting holes. However, the top of the case wouldn't snap back into place. The top is held in place by some extensions off of the top that snap into holes in the top of the the case. Those extensions couldn't move past the fan's enclosure. This fan was just wider than the stock fan.So, I used a small cylindrical grinding attachment in my Dremel tool to remove small amounts of the fan encasement that were blocking the top's extensions. After that, it the case's top snapped right into place, and I was ready to test both fans.I started my computer - and the fan's sounds were appreciably reduced! Plus, both fans showed up in my fan monitoring utilities. Very pleased! Thinking about replacing one or both of the case's front mounted 200mm fans. 5Flow Acceleration Channels, you say? Tell me more. Maybe you read the product description and aren't sure what, "turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity" means. That's okay. All you need to know is that there's a reason these fans are so highly rated.All of my case fans, in all of my computers, are Noctua's. I replaced my Corsair AF140s with these. I replaced my NZXT FN V2 fans with these. I replaced a lot of different brands' fans with these. Neither of the aforementioned brands' fans are bad, either; they're just not *as* good.The cooling performance is top notch, but what really makes them shine is the noise ( or lack thereof ). These ( and Noctua fans in general ) are really the only choice for a quiet PC build that doesn't compromise on cooling capabilities. Yes, they're more expensive, but they're more expensive for a reason. And really, we're talking about, what, ~$5 difference in price? Skip the Starbucks for a day and you're covered. Seriously. It's worth it.10 / 10 will continue to buy for every PC build going forward 5So far so good...see other thoughts. I bought five of these for a new PC build. I had never used Noctua products before, though I knew of their reputation, so I was unsure what to expect. Unfortunately, after a little less than a month, one of the five fans started creating excessive vibration and making a rhythmic hum (very audible). The pitch of the sound was too annoying to tolerate so I opened up the PC and narrowed it down to the specific offending fan. My assumption is something is wrong with the fan's axis/bearing because structurally the fan appeared to be fine. I looked up my order on Amazon and unfortunately my return window had expired. I ordered a replacement fan and installed it, no more vibration or noise, all good. I will update the review if I have further quality/longevity issues.Pros:Very robustly built, no cheap construction here.Anti-vibration options are very nice, fan mounts and over-moldings on corners (front and back)Extra wiring options provided with the fan are much appreciated.They deliver on noise suppression, I have five 140's running at 60% speed and I barely notice the machine.Cons:Expensive for a fan. ~$130 is a lot of money to spend on case fans...Beige color maybe offputting (I don't mind it).1 out of 6 fans was defective. Disappointed.Other Thoughts:Hopefully my one defective fan is an aberration. I'm willing to give Noctua the benefit of the doubt here because of their reputation, but the fact remains, it didn't take very long for one of them to go bad. Further annoyed I couldn't return it and had to purchase another one. Otherwise, I'm very pleased with their performance in my machine.**Edit** Upon reading other reviews, I realized Noctua has recently started having their products made in China. I checked all six of the boxes for my fans and all six were Made in China. I am not so confident now that my defective fan was an outlier, if Noctua is sending production out to China now to cut costs, it is not good. Even if they have good drawings from Noctua's engineering department, the Chinese do not manufacture products consistently within tolerance. Quality will suffer. 4So quiet I thought I did something wrong I purchased these to replace the Corsair fans that came with my h115i liquid cooler. I do a lot of 3D rendering on my overclocked 6800k, so was constantly dealing with loud fans on my radiator as they ramped up to 2000rpm to keep the cpu you at an average of 62C. I expected these things to be quieter than the Corsair stock fans, but I had no idea they would cool my cpu while maintaining a lower rpm.At 100% load with the Corsair fans I was around 2000rpm at around 62C. With the Noctua fans, I am now at around 52C running at 800rpm at 100% load. So not only are they running at less than half the speed over the Corsair fans, they are keeping it 10 degrees cooler. Amazing. I can't recommend these enough, especially if you do a lot of cpu intesive work like video or 3D rendering. I'm considering replacing all my case fans as well. 5Powerful but... These fans are really good with the air flow but as for actual quality and noise wise it kinda dissapointed. OTher people have pointed out this might be due to a different manufacturing process rather than from Taiwan and it is from China now or something like but after using this on my case. It is VERY loud even with the noise reduction plugs that connect to the power. And it seems like the fan quality varies on each fan. I tried plugging them into multiple ports/connections and some of the fans are louder than the others and give of this loud hum. Forget about using this if you dont use the noise reduction plug, cause without it and the power reduction it sounds like a jet engine about to blast off into space. But if you want this for pure airflow then this is great because for sure it is powerful and good at pushing and pulling air if thats your concern. For me I wanted quiet with performance and this kinda dissapointed 3Built a very high end video editor and these keep it super cool I love these fans. They are very quiet and I've never even heard them speed up, and I edit youtube videos with about 20 minutes length, with heavy effects, so it kicked my last pcs butt. But this pc rocks and never gets noisy at all. Sure I can hear it but it's literally right next to me, at chest height and I never really notice more than a quiet hum, so this tells me they are doing a great job at keeping it cool while staying quiet. It's really silly when some comment on the color. I have a smoked glass cover and really can't even tell what color they are, so who cares. They seem to be heads above others in noise and design, so I would gladly buy them again. 5Silence is almost golden. This review is for Noctua 140mm Premium Quiet Quality Fan with PWM (four connector plug)It's not often that you get to truly enjoy a piece of hardware in IT - apparently the Austrians know how to make that happen. Even before I had received the fan I already had an email with contact information in case there should be anything wrong with the fan. Then the moment arrives when you hold the the nicely book style packaged fan in your hands, glance with joy over the included cable and mounting accessories before you finally get to install it. Welcome to acoustic heaven on earth. In this particular case two Corsair stock fans included in the H115i water cooling system were permanently retired due to their annoying sound habit and replaced by two of the Noctua fans. Silence - or the absence of annoying sounds is difficult to describe - unless you were fortunate to ever be in Antarctica. As a long time member of silent pc - I wholeheartedly endorse these fans - even if they have an odd color (maybe working towards golden) and no lights. 5Beware of visible manufacturing differences with made in China fans I recently purchased three Noctua NF-A14 PWM fans on Amazon, sold by Noctua Cooling Solutions, to add to 2 of the same fans purchased previously from another retailer. I was surprised to discover that the three NF-A14 fans I received from Amazon were made in China, whereas the 2 fans purchased previously (as well as multiple other Noctua fans and CPU coolers I have purchased in the past) have all been made in Taiwan. Now the actual location made is not that critical to me *so long as* the products are the same high quality that Noctua is known for. So I am disappointed to find that the 3 fans that were made in China are of noticeably inferior quality to the fans made in Taiwan. I have attached several comparison pictures.Noted differences:1. The fan blades on the Taiwan made fans are noticeably smoother and more rounded than the ones made in China, which have rough edges at points.2. The "Flow Acceleration Channels" on the blades of the Taiwan fans are much more defined than the channels on the made in China fans; the channels on the Chinese fans are barely raised from the blades.3. The "Inner Surface Microstructures" of the made in Taiwan fans have a distinct waterdrop shape, whereas the made in China fans just have a shallow triangular cutout.4. There is a noticeable difference in frame color (see images). The problem with the difference is that the fans do not match the other Noctua case and CPU cooler fans in the 3 builds that I am putting together, as all the other fans were made in Taiwan.5. The made in China fans have a noticeably louder droning sound when spinning at the same RPM as the other fans.I communicated these differences with Noctual Cooling Solutions and they claim that the differences are within their manufacturing tolerances and do not affect performance. But Noctua is known for its reputation of highest quality and attention to details, and I'm sure that Noctua engineers designed all these tiny details to exacting specifications in order to obtain the best possible performance, so it concerns me to see such visually noticeable differences, even if I do not have the instrumentation to measure the impact.The biggest issue is that if there are such obvious visible differences in exterior quality, I am concerned that there is also a difference in quality in the internal motor, which I cannot see. It is not something that I want to discover down the line after the fans have been installed and used for some time. 2
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Reviews

Customer Reviews

The NF-A14 PWM is the best all-around 140mm fan in the world. The NF-A14 PWM is the best all-around 140mm fan in the world, even better than its more expensive brother, the iPPC variant.There are a few points that are worth knowing:1: Quiet. Like all tan and brown Noctua products, the NF-A14 PWM is borderline silent in almost all uses. The beauty of this is that it requires no knowledge, or specialized software/hardware, to get it to run appropriately. Simply plug it into a PWM-enabled fan header and let the computer run it. It'll be silent or near silent in almost all conditions.2: Powerful. This fan produces excellent pressure and airflow. Unlike the 120mm fan Noctua equivalents, the 140mm line is designed, in general, for all-around performance, so it works great on heat sinks/rads, intakes and exhausts.3: Position invariable. Almost all fans use sleeve bearings, which in a typical position, where the bearing is perpendicular to the ground (think front case fans), are both quiet and long lasting. However, when placed parallel to the ground (think your power supply fan), they can become noisy and fail prematurely. The SSO2 bearings in the NF-A14 PWM are unaffected by position, making these great for fans that are mounted at the very top of your case or radiator.4: Long lasting. In large due to those superior bearings, these fans will last much, much longer than your computer will be relevant. You will easily get 4 or 5 entire computer builds out of reusing these fans, and given that fan technology doesn't advance at the rate that other computer technology does, you could conceivably reuse the same fans for 10 years or even longer.All in all, the NF-A14 PWM is my favorite fan within Noctua, including their higher speed iPPCs (which I also own) and their smaller fans. 5Made in China made it worse for the same price. I bought so many fans and cooling solutions from Noctua and never been disappointed before.This is the third 140mm fan from Noctua that I bought, this time it arrived Made in China, which is a certain no for me.Although the fan does perform very well, there are a lot of cosmetic imperfections as a difference in color, uneven finish, rounded edges.They never advertised the product as Made in Taiwan or not Made in China, but when you are selling a product as a "Premium" one and the price certainly it is, they should never let their quality, performance nor cosmetic, go down, it is like buying a second tier Noctua products and they didn't even lower their prices.In the past, their fans were my first choice, it didn't matter the price, from now on, they will not be my first choice anymore.I will be looking for other brands for fans and cooling solutions. 2Significantly quieter, show up in fan control interfaces, but I had to make mounting adjustments. The back fan that was stock with the computer case ran sometime, sometime didn't...it was just about done. Plus, even though it was a four-pin fan and was powered by the motherboard, it wouldn't show up in either the motherboard's UEFI BIOS Utility, nor in a third party fan monitoring program. Thus, I couldn't monitor the fan, and didn't know if it was being controlled by the motherboard or not.So, I decided to replace it with this fan hopefully reducing fan noise and providing fan monitoring and control too. This fan comes with flexible, sound dampening mounts that are a great idea. They isolate the fan from the case. But I simply didn't have room in the case to pull those mounts through the case's mounting holes and then through the mounting holes of this fan. So, I had to resort to using the screws (included) to hold it in place.The case's top fan was still working. Here again, it was a 4-pin fan attached to the motherboard. But, it too wouldn't show up for monitoring purposes. So, I replaced it with Noctua NF-A20 PWM, Premium Quiet Fan, 4-Pin (200x200x30mm, Brown).However, I had a problem with this fan's overall size. The top of the computer case is removable, making replacing the fan an easy job. It was easy to push/pull the elastic mounts through the fan mounting holes. However, the top of the case wouldn't snap back into place. The top is held in place by some extensions off of the top that snap into holes in the top of the the case. Those extensions couldn't move past the fan's enclosure. This fan was just wider than the stock fan.So, I used a small cylindrical grinding attachment in my Dremel tool to remove small amounts of the fan encasement that were blocking the top's extensions. After that, it the case's top snapped right into place, and I was ready to test both fans.I started my computer - and the fan's sounds were appreciably reduced! Plus, both fans showed up in my fan monitoring utilities. Very pleased! Thinking about replacing one or both of the case's front mounted 200mm fans. 5Flow Acceleration Channels, you say? Tell me more. Maybe you read the product description and aren't sure what, "turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity" means. That's okay. All you need to know is that there's a reason these fans are so highly rated.All of my case fans, in all of my computers, are Noctua's. I replaced my Corsair AF140s with these. I replaced my NZXT FN V2 fans with these. I replaced a lot of different brands' fans with these. Neither of the aforementioned brands' fans are bad, either; they're just not *as* good.The cooling performance is top notch, but what really makes them shine is the noise ( or lack thereof ). These ( and Noctua fans in general ) are really the only choice for a quiet PC build that doesn't compromise on cooling capabilities. Yes, they're more expensive, but they're more expensive for a reason. And really, we're talking about, what, ~$5 difference in price? Skip the Starbucks for a day and you're covered. Seriously. It's worth it.10 / 10 will continue to buy for every PC build going forward 5So far so good...see other thoughts. I bought five of these for a new PC build. I had never used Noctua products before, though I knew of their reputation, so I was unsure what to expect. Unfortunately, after a little less than a month, one of the five fans started creating excessive vibration and making a rhythmic hum (very audible). The pitch of the sound was too annoying to tolerate so I opened up the PC and narrowed it down to the specific offending fan. My assumption is something is wrong with the fan's axis/bearing because structurally the fan appeared to be fine. I looked up my order on Amazon and unfortunately my return window had expired. I ordered a replacement fan and installed it, no more vibration or noise, all good. I will update the review if I have further quality/longevity issues.Pros:Very robustly built, no cheap construction here.Anti-vibration options are very nice, fan mounts and over-moldings on corners (front and back)Extra wiring options provided with the fan are much appreciated.They deliver on noise suppression, I have five 140's running at 60% speed and I barely notice the machine.Cons:Expensive for a fan. ~$130 is a lot of money to spend on case fans...Beige color maybe offputting (I don't mind it).1 out of 6 fans was defective. Disappointed.Other Thoughts:Hopefully my one defective fan is an aberration. I'm willing to give Noctua the benefit of the doubt here because of their reputation, but the fact remains, it didn't take very long for one of them to go bad. Further annoyed I couldn't return it and had to purchase another one. Otherwise, I'm very pleased with their performance in my machine.**Edit** Upon reading other reviews, I realized Noctua has recently started having their products made in China. I checked all six of the boxes for my fans and all six were Made in China. I am not so confident now that my defective fan was an outlier, if Noctua is sending production out to China now to cut costs, it is not good. Even if they have good drawings from Noctua's engineering department, the Chinese do not manufacture products consistently within tolerance. Quality will suffer. 4So quiet I thought I did something wrong I purchased these to replace the Corsair fans that came with my h115i liquid cooler. I do a lot of 3D rendering on my overclocked 6800k, so was constantly dealing with loud fans on my radiator as they ramped up to 2000rpm to keep the cpu you at an average of 62C. I expected these things to be quieter than the Corsair stock fans, but I had no idea they would cool my cpu while maintaining a lower rpm.At 100% load with the Corsair fans I was around 2000rpm at around 62C. With the Noctua fans, I am now at around 52C running at 800rpm at 100% load. So not only are they running at less than half the speed over the Corsair fans, they are keeping it 10 degrees cooler. Amazing. I can't recommend these enough, especially if you do a lot of cpu intesive work like video or 3D rendering. I'm considering replacing all my case fans as well. 5Powerful but... These fans are really good with the air flow but as for actual quality and noise wise it kinda dissapointed. OTher people have pointed out this might be due to a different manufacturing process rather than from Taiwan and it is from China now or something like but after using this on my case. It is VERY loud even with the noise reduction plugs that connect to the power. And it seems like the fan quality varies on each fan. I tried plugging them into multiple ports/connections and some of the fans are louder than the others and give of this loud hum. Forget about using this if you dont use the noise reduction plug, cause without it and the power reduction it sounds like a jet engine about to blast off into space. But if you want this for pure airflow then this is great because for sure it is powerful and good at pushing and pulling air if thats your concern. For me I wanted quiet with performance and this kinda dissapointed 3Built a very high end video editor and these keep it super cool I love these fans. They are very quiet and I've never even heard them speed up, and I edit youtube videos with about 20 minutes length, with heavy effects, so it kicked my last pcs butt. But this pc rocks and never gets noisy at all. Sure I can hear it but it's literally right next to me, at chest height and I never really notice more than a quiet hum, so this tells me they are doing a great job at keeping it cool while staying quiet. It's really silly when some comment on the color. I have a smoked glass cover and really can't even tell what color they are, so who cares. They seem to be heads above others in noise and design, so I would gladly buy them again. 5Silence is almost golden. This review is for Noctua 140mm Premium Quiet Quality Fan with PWM (four connector plug)It's not often that you get to truly enjoy a piece of hardware in IT - apparently the Austrians know how to make that happen. Even before I had received the fan I already had an email with contact information in case there should be anything wrong with the fan. Then the moment arrives when you hold the the nicely book style packaged fan in your hands, glance with joy over the included cable and mounting accessories before you finally get to install it. Welcome to acoustic heaven on earth. In this particular case two Corsair stock fans included in the H115i water cooling system were permanently retired due to their annoying sound habit and replaced by two of the Noctua fans. Silence - or the absence of annoying sounds is difficult to describe - unless you were fortunate to ever be in Antarctica. As a long time member of silent pc - I wholeheartedly endorse these fans - even if they have an odd color (maybe working towards golden) and no lights. 5Beware of visible manufacturing differences with made in China fans I recently purchased three Noctua NF-A14 PWM fans on Amazon, sold by Noctua Cooling Solutions, to add to 2 of the same fans purchased previously from another retailer. I was surprised to discover that the three NF-A14 fans I received from Amazon were made in China, whereas the 2 fans purchased previously (as well as multiple other Noctua fans and CPU coolers I have purchased in the past) have all been made in Taiwan. Now the actual location made is not that critical to me *so long as* the products are the same high quality that Noctua is known for. So I am disappointed to find that the 3 fans that were made in China are of noticeably inferior quality to the fans made in Taiwan. I have attached several comparison pictures.Noted differences:1. The fan blades on the Taiwan made fans are noticeably smoother and more rounded than the ones made in China, which have rough edges at points.2. The "Flow Acceleration Channels" on the blades of the Taiwan fans are much more defined than the channels on the made in China fans; the channels on the Chinese fans are barely raised from the blades.3. The "Inner Surface Microstructures" of the made in Taiwan fans have a distinct waterdrop shape, whereas the made in China fans just have a shallow triangular cutout.4. There is a noticeable difference in frame color (see images). The problem with the difference is that the fans do not match the other Noctua case and CPU cooler fans in the 3 builds that I am putting together, as all the other fans were made in Taiwan.5. The made in China fans have a noticeably louder droning sound when spinning at the same RPM as the other fans.I communicated these differences with Noctual Cooling Solutions and they claim that the differences are within their manufacturing tolerances and do not affect performance. But Noctua is known for its reputation of highest quality and attention to details, and I'm sure that Noctua engineers designed all these tiny details to exacting specifications in order to obtain the best possible performance, so it concerns me to see such visually noticeable differences, even if I do not have the instrumentation to measure the impact.The biggest issue is that if there are such obvious visible differences in exterior quality, I am concerned that there is also a difference in quality in the internal motor, which I cannot see. It is not something that I want to discover down the line after the fans have been installed and used for some time. 2
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