VIVOSUND4 4 Inch 195 CFM Inline Duct Ventilation Fan HVAC Vent Blower for Hydroponics Grow Tent

This is a solid fan. The last one I bought had good air flow, was reasonably quiet and lasted 5 years. Not a fancy option but solid and I just bought my second one.

Using this pump to evacuate resin fumes from a grow box, makes staying in the same room fine until the door is opened, so it must be enough to create negative pressure for a 2x3x4ft cube.Not very loud, about as loud as a box fan on medium. Overall ticks all the boxes I needed, been running 24/7 for a few weeks now.

Works well, LOUDER THAN ADVERTISED. The 28 decibels that are claimed is going to be on the lowest possible speed. From what I understand that is industry standard for reporting sound, but don't think that you're going to get there rated CFM at an amount of noise that is unnoticeable. You can talk over it at the rated CFM, but 28db is misleading. Still, moves the warm air as needed. I've bought this brand before, and will do so again when needed.

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

Pretty good fan. Not very loud. I bought it to use for an ice box and it works perfectly for that. Good air flow. Don’t have to turn the speed up very high to keep the box cool. Haven’t had any issues with any of the shoes I’ve put in there yet. Would definitely recommend this fan for that purpose.

I've bought three of these over time and installed them in the same service. I have it installed outdoors in a do-it-yourself radon abatement system. They're cheap, and initially they're very quiet, but after a year or so of continuous running they start to make noise which becomes more and more objectionable. It's kind of obvious the bearings just aren't up to the job. Fine for short-term use, but I've finally learned my lesson.

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.

Had this fan for a month or so and enjoy the performance. Moves a good amount of air without being too loud. Works great in my 4x2.