iPower Inline Booster Duct Fan 4'' 106CFM with Speed Controller, Low Noise HVAC Blower for Grow Tent, Basements, Bathrooms and Kitchens, 2 Pack

Good product, no issues.

Perfect fit & quiet

Does have as little noise.

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

Wanted this to extract smoke from a laser engraver.I think it will be fine.Decent airflow.It just seems like the speed control is doing nothing but on and off.

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?!

The media could not be loaded. I'm struggling to think of any way this could be any worse lol.First off, the unit is fairly loud. I did not notice any vibrations as other reviews stated, it's smooth, just loud for what it is. About the same volume as the actual ac unit in my house.Second, the speed controller does almost nothing. The difference between low and high is barely percievable. Maybe a 10% speed difference between the extremes.Last and most importantly, it's so very, Very, VERY weak. It doesn't even have the power to move air down the length of it's own hose when the hose is stretched out to six feet. Seriously, watch attached video. Can't even move a piece of paper.As a fan, for moving air, or ventilation it's completely useless. It would make a decent white noise machine but that's about it.

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.