AC Infinity RAXIAL S6, Inline Booster Duct Fan 6” with Speed Controller - Low Noise Inline HVAC Blower Can Fan for Basements, Bathrooms, Kitchens, Workshops

This 6 inch fan is probably more value for my money than any other purchase in the past few years. It's powerful, compact, and quiet for it's power. Some fans that I’ve tried can sound a little wobbly at lower speeds, but this one is steady throughout. My only wish is that the fan could spin even slower, but I’m not sure that should be expected with a 6 inch attic fan.

I have a 2 story house. Upstairs is hot in summer. Brand new furnace and a/c. I installed 2 boosters. One for each bedroom upstairs. It works great. These replaced other ones I had installed 5 years ago that did not have an adjustable speed. Those worked but were so loud and blasted almost too much air. These are perfect as you can adjust for smaller rooms and dial it down. The highest setting is too loud and annoying, medium is just a shade louder than a normal furnace when it’s blowing at a high speed. I set mine just below medium and it blends In with the furnace so you can’t really notice it. I scoured reviews before buying this, I hope this is useful to someone.

I bought this S6 fan to create some circulation in my basement The fan works well and seems to be well-made.My basement is about 2000 sq feet and is chopped into these three main areas:Space A. Unfinished area (about 350 sq feet)Space B. Main living area (about 1200 sq feet)Space C. Exercise/rec room. (450 sq feet)Space A connects to Space B via a door. Space B connects to Space C through another door. Space C does not connect to Space A directly.We have a humidity/mold problem throughout the basement, so I installed a dehumidifier in Space A. I wanted to pull air from Space C over the wall into Space A then push it out to Space B and back to Space C to complete the cycle. I am hoping that by circulating some air through space A the dehumidifier will dry out the whole basement over time.My dehumidifier is rated to process 160/190 cfm on its two speed settings. So I bought this 265 cfm AC Infinity S6 fan and 8' of 6" flex duct from AC Infinity as a circulation fan. My configuration is as follows:I cut a a 6" round opening in the Space C ceiling. I put a 90" hard elbow there and attached the 8' of 6" duct that terminates in Space A.In Space A at the other end of the duct I mounted this fan onto a 12x4x6 90-degree register box and a 12x4 diffuser. I hope to pull over some air from Space C past the dehumidifier.Issue: After completing the install, the noise level in Space C at all fan speeds (where the intake vent is) is higher than I would have liked. I measured some dB readings with my iphone app and here are the results.[NOTE: For reference, in this next part I am looking at the speed control's dial like a clock face, where you have the "off" position at the 6:00 (bottom) position. Then "Low" is at 8:00. "Medium" is at 12:00 (top). And "High" at 4:00 position.]While the controller seems infinite, there are really only three or four distinct areas of power/noise:At the 8:00 and 9:00 position, the noise level in space C is about 40 dB.At 10:00 position it jumps to 49 dB (nearly ten times louder).At 11:00 - 12:00 it is about 52 dB.Then at the 1:00 position it jumps to 54 dB and doesn't really get much louder from there.Recall that the dB scale is logarithmic, not linear. If there is a relationship between noise and cfm, then between the 1:00 position and 4:00 position, it seems there is very little air volume increase.I am not an HVAC engineer nor a sound expert, but it seems you have a low 40-ish dB setting, a low 50-ish dB setting and then a 54 dB setting, all as measured on the inlet-side vent, which for me is 8' from the fan. I would like to make it quieter in Space C because my wife spends a lot of time down there, and she doesn't tolerate noise well.I don't really care about the noise level in space A, as it is not occupied and the dehumidifier (generating 52 - 54 dB) is in there too. But for reference, with the fan attached right to the register outlet box, the noise levels in Space A (without the dehumidifier running) are 2 - 4 dB higher than the above readings from under the inlet vent in Space C.Note: I have 9' basement ceilings, and I took all measurements directly beneath the vents at 5' up from the floor. Not a scientific result, but I hoped to give you all some idea of the noise levels.

Thank you

I got this for my grow tent setup. It’s not huge, so I didn’t need an actual inline fan, but I did need something to exhaust hot air. I’d tried another brand before this one, and kicked myself because I should have just gotten this one in the first place. The other one sounded like a jet engine on the lowest setting. This one moves a good amount of air while also being quiet; I notice it when it first starts up then it fades into background noise.Before I added this fan, my tent was getting close to 90°, even with 2 small fans blowing. With the fan, my tent stays between 76°-79°.

I have run this fan continuously for 6 months straight every single year for three years now. My power bill goes up about $2.75 per month when I do this. Zero problems with bearings or speed controller. I installed it to draw hot air from the top of a room with a wood stove and blow it into a cold back room. On wide open speed the fan is a bit noisy (short duct work has no turns in it). But I only run it at that speed on the very coldest February days. Tuff little fan. Love the speed controller. It replaced a single speed duct fan that had only lasted 2 years before the bearing gave out. Only negative I have about this unit is fits loose in standard 6" diameter duct piping. Did I tell you I love the speed controller?

Quiet at max rpm. Only takes 20 minutes of runtime to dry out my full tile shower. Note I do have a very small bathroom.

So I tried the hon&gaun, ac infinity raxial s6 and ac infinity cloud line pro s6. The hon&gaun definetly moved the most air for the money but it was the only one that I could here the motor running both standing next to it and at the end of the vent over 20 feet away even running only 40%. But even at 40% it still moved a lot of air and there was not too much turbulence so the air noise was minimal but motor noise was loud. I really don’t recommend this unless it is somewhere we’re the noise doesn’t matter. The ac infinity raxial was the opposite, a bit more money, moves far less air, the motor is silent but the lousy impeller creates a lot of turbulence creating a lot of air noise that is mainly heard at the end of the vent. Last was the ac infinity cloudline pro, it’s far more expensive but far superior, moves lots of air, motor can’t be heard even standing right next to it and the air flow is smooth and quiet. It also offers optional WiFi controller that is very easy to use, can control up to 4 fans which can be controlled by your phone, by set speed, schedule, atmospheric pressure readings, temperature or humidity. This allows you to put the probe in a vent and have the fan only run when ac, heat or humidifier are running.