VIVOSUN Inline Booster Duct Fan 4” 106 CFM with Speed Controller, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens, Attics, Grow Tents

Really quite, operates perfectly and does the job. Also its light weight, so it mounted up easily.

This exhaust fan works great. I have had it and tested it for over a month now. It is very quiet, I wish bathroom motors were this quiet, next the power dial also controls the speed of the fan. the fan speed is completely adjustable this is a HUGE bonus. Most air duct exhaust fans are either on or off, this one has fan speed control. It hooks up pretty easy the length of the cord is about 6 feet which is good. The on off switch is the dial, so the only negative is the switch position. I wish the switch was closer to the outlet and further away from the actual inline booster module.

The fan works ok its fairly quiet got the combo kit with vent tube and bought a carbon fiber filter trying to save money, now wishing i would have spent the money as its not moving quite enough air out of my 2x2 tent. Over all im not in a loss but will have to buy something else if i upgrade.

Well made and a good value for the money. I will be using it to ventilate an unheated crawlspace so I got the 8 inch model. It will move a lot of air.

Welp...I ordered this fan a while ago, and finally had a chance to get it installed. The speed control only seems to have one setting no matter where you set it. I'm not sure what speed it's running, but the fan moves almost no air once you connect about 6 feet of ductwork to it. It's pretty much worthless...

Overall it does its intended purpose. But I feel like it doesnt move as much air as I would have thought. Also the adjuster knob barely adjusts. The difference between barely on and full blast is pretty negligible.

I have an 800 cfm squirrel cage style blower in my brewery above a pilot system to evacuate heat and steam. The motor can't be exposed to the moisture, so I ducted it through a 4" diameter down-pipe ending a foot above the floor to pull cooler air into the motor.That down pipe proved to be too restrictive to provide enough air to keep the motor from thermal-tripping, so I added this small blower to the down-pipe, and it has made all the difference needed. Where I had been experiencing a couple of motor shutdowns due to overheating on most brewing days, I haven't had any since installing this blower.All that related, this little fan moves just enough air to suffice my needs - it isn't going to impress anyone with the volume it moves. But for an application that doesn't need a lot of air movement, this could work.Cheers!

I live in a high moisture state so I have very high humidity and I have a small tent that’s about 3 x 2 1/2 x 5 1/2‘ and this little fan was not enough to completely manage this tent, but it did cool the tent off by itself Wasn’t strong enough so I ended up buying a viva sun in-line fan instead of returning this little fan I kept it and now I use it as a nonpassive when needed and that it works perfectly it’s light so I literally installed it directly in the vent of the temp since I have two clamping sites on the temp and hold it perfect and That’s it 2426 bucks totally worth it, but I would say don’t think it will be your final solution if you live in a humid climate