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

Awesome little fan. Weighs almost nothing, dimmer control is a nice touch. It's way quieter than I expected seems pretty durable.

Amazing product, would definitively buy again and highly recommend!

Seems to work fine it had some plastic bouncing around the motor when I unboxed it. Initially the blade it was rubbing the housing. Don't know where the plastic piece came from.

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 was experiencing very little air flow at the end of my living area at the farthest point from my furnace. I installed two of these fans in two 6inch round HVAC ducts. I used relays, triggered by my furnace convection blower motor circuit to power receptacles where I plugged in the fans. Note the fans are approximately 1/10 inch smaller in diameter then the 6 inch duct work. However, this slight difference facilitated reconnecting the duct work.

The Inline Booster Duct Fan 6” was well package. I like that the body has no seams. It's all one piece. Fan seems higher quality than the cheapo replaced that was 1/2 the CFM. Used it on my HVAC duct work coming from the furnace. Short run with 3 elbows. Was a little surprised the existing fluted 6" furnace pipe would not slide into the wider side of the fan housing. Ended up working out great as the fan can fit into a pipe that is cut in 1/2. That way you can expand the pipe outward from the fan body as needed and you can get it into really tight spaces. Make sure you have some aluminum tape to seal.Fan on max I'm guessing tripled output. Noise not much different than existing sound from vents at least for me as furnace in the basement was not too far from 1st floor room. If you have loose duct work, that volume of air pushed might make more noise. I don't.

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.

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.