VIVOSUN D4 4 Inch 195 CFM Inline Duct Ventilation Fan, HVAC Vent Blower for Grow Tent, Attic, Basements or Kitchen, Hydroponics Exhaust Booster Fan

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.

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.

I really debated on four or five stars. I can't give it two stars since I'm using it as a bathroom fan (not it's intended purpose). I noticed the fan really chokes down if you restrict the inlet at all. But chokes less if you restrict the outlet, so I put my back draft door on the outlet. It is certainly quiet and has a much more pleasing tone than the $150 garbage bath fans you get from the depot.' This fan seems to be well constructed with good bearings, well balanced and the wired plug is a nice thing to have...... fits 4" duct reasonably well.... a great mounting bracket. In all, for MY purpose it's meh, but again, it's intended to be an HVAC fan so I can't give it too hard a time. The price is less than the depot fan and I still think it moves double the air of a depot fan, just not 200cfm in my application.

I purchased this inline fan after my Vevor inline fan was giving me issues for the second time. Instead of troubleshooting with them again, I decided to buy this and it’s so much better. I use it for my laser engraver and although there’s no on/off switch, the unit is not loud and I could not smell any smoke whatsoever. Very happy with my purchase.

This is a really good fan to use for my homemade airbrush paint booth. Coupled with a dryer lint trap, it works like a charm. It moves a lot of air. I will say that the fan is a bit loud, but the acoustics of the box are likely amplifying it. Other than that, it's a great fan with a built-in speed controller.

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.

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.

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