VIVOSUN D4 4 Inch 195 CFM Inline Duct Ventilation Fan HVAC Vent Blower for Hydroponics Grow Tent

I use this in combination with a VivoSun 4 inch carbon filter to eliminate the smells from my plant tent. the air flow is really good although not adjustable. installation is super easy and the build quality is amazing. it both cleans the air and cools the area at the same time. the only thing i wish is it was a little bit quieter. unless this is in a closet or behind closed doors the sound might bug you. but it doesn't claim to be silent so i’m still giving it 5 stars. I have bought another one since and love them both

The first one I received only worked about 10 minutes. But you're going to find a faulty product once in awhile. But I will say they were super quick and then response from customer service and sent me a replacement immediately. It moves a lot of air

definitely much louder than the advertised 30dB. Not having a fan speed control or power switch is a nuisance, especially in conjunction with it being so loud. But at $27 it was a reasonable compromise at the time.

Used this to help vent car exhaust from my garage for troubleshooting purposes. Coupled with some flexible dryer-type hose, this works great to keep me alive if I need to run the car in the garage.

high quality and low noise level wit the best air flow

It's cheap, it has exceptional airflow, but there is no speed control and it's very loud (I measured 55db from 3 feet away). Since I'm using it to ventilate a 3D printer in a home office, this is way too loud. If noise isn't a concern for you, this is an excellent bargain option, but if you are placing it somewhere like a home office where you will be spending time, I'd recommend spending a little more on a more quiet (and speed-controlled) option.

The media could not be loaded. In making this next generation gaming computer, with an 8 gig Radeon video card among other things, the blowing or ambient heat from the computer is enough to heat a small room. I can & have used it in the winter to do that. Well, I was running something, & it was on over night.In the summer, I want to expel this heat so I can stand to be in there, gaming. Trying to get the right CFM to noise ratio can be difficult in a computer environment, in a small room. Mainly home based. This extractor from VivoSun is a great one.It's not quiet, & sometimes I can't wait to turn it off, but it pulls out the heat like I want it to, well, enough to keep the temps nice. Generally, the CPU's radiator will get up to about 107°F-113°F (42-45°C ) with this 195 CFM fan bringing it to (32°C-37°C) 89.6°F-98.6°F & it's pulling most of that heat out the window.I included a snap of some general video editing temps with out the VivoSun, & the bottom one is after it got going. The temps dropped in about a minute, which is super fast! When I "forget" to turn it on, & the computer gets up to about 45°C, it takes the exhaust about eight odd minutes to bring it down to 35°C & about a full 10 minutes to level off at 33°F.So that's not bad really. I have tried a small CFM unit (106 CFM), but the pull just wasn't there. I have included a video so you can hear how it sounds. Of course, it's muffled a bit, being I captured it from my phone, & recordings always sound different than your ear. If I can, I'll try to include a video of the room's cooling turbo fan so you can hear them both.Not bad, but not whisper quiet. They don't claim to be, either, so nothing on them. If I bring the tower down to the floor, or move it away, that will change things a whole bunch.If you're thinking about adding an external cooler to your gaming/video unit, I strongly suggest VivoSun. The product works great, & they are on top of any blips you may have. In fact, they helped me upgrade to this unit with a matter of an e-mail. That's AWESOMENESS to the 10th!Now I don't have to "worry" about leaving the computer on for a bit while I'm in the middle of a game, or when I step away for a moment. I know that this exhaust fan is going to keep the system cool.Bottom line, this exhaust fan works very well sealed to my tower's top fan port. So much that I will be adding a smaller one to my 3D printer to better help regulate the temps in that case.I did need to purchase dryer duct (hose), & a 4" inlet pipe. The aluminum tape & clamps came with the dryer ducting. I used some sticky sound dampening on the I/O exit panel to better direct the air flow being pulled up & out.Also, it has holes in the "feet" for more secure mounting. I just hot glued it.

Works alright, very cheaply made.