iPower Inline Booster Duct Fan 6'' with Speed Controller, Low Noise HVAC Blower for Grow Tent, Bathrooms, Basementsand Kitchens, 2 PackRecycled Claim Standard 100

The guy that says this thing is no good shows him trying to blow the air through the air duct don't have a clue do you I bought these couple of times they work great this the smaller one doesn't move as much air, the 6-inch one is quite better but come out is a 4-in fan and the controller doesn't go super slow on low but it does control it don't listen to that guy and the shipping is fast they work great but if you need a lot of air get the 6-in one it's a little bit of difference but these people that leave negative feedback it don't make sense ruin it for the rest of it

Perfect fit & quiet

Works fineNoisy. Even at. Low speedBut as expected

Good product, no issues.

Very noisy for house use. need to take measures for sound attenuation even a low speed.

This is the second one of these fans I have purchased. I use them in my mycology lab for air exchange, and since I upgraded to a lab double the size, I needed another fan to move some air, obviously my first purchase of this item is still in working order and just as powerful as the day I bought it (05/2023), so why fix what isn't broken by going elsewhere for a new fan?!

First, the fan noise is reasonable. The fan might suffice for some applications out there (i'm not sure what.).... That said, I got this for exhausting 3D printing in a 9 cu. ft. enclosure and returned it. The air intake is very weak. The position of the motor bracket causes turbidity at the intake (some in/out). Maybe a cone over the intake would help. I also grow microgreens in a basement vertical farm and this isn't a solution for that either... some simple USB 120mm case fans far outperform this fan at a fraction of the cost, despite a slower speed. I think the blades are poorly designed. If you're getting into 3D printing or laser engraving, spend another $30 and upgrade to a higher cfm 6" fan. Don't risk your health. Growers have better options too.

We've been using this as an additional. Blower for underneath the bed, coming from the furnace vent, and it's been working wonderful for over 2 years now. You're able to adjust the speed of the fan, but this helps blow the hot air or cold air from under the bed out to heat the room.