VIVOSUN 6 Inch Inline Duct Fan 240 CFM, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens and Attics, Silver

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This works excellently as an exhaust ventilation fan. It is powerful enough that it pulls the tent walls in very well, so it definitely moves a good amount of air. It is not terribly quiet, but it is also very powerful, so that is the trade-off. There is no built-in timer, but I used it with a smart outlet when I wanted to give it a break now and then. Recently, I have had it running pretty much nonstop for the last few weeks with no issues. Overall, I would highly recommend it if you need a strong inline duct fan for ventilation.

Mine has gotten intermittent use since 2017. I just looked inside and cleaned out the dust and dirt. I hooked it up to a dimmer and it seems to work great. My only criticism is that it's loud, but if you just need good air flow, it gets very quiet with the dimmer. Good job Vivosun

Cons: -Louder than I had hoped. Bought for boosting upstairs cooling in two storey house. Very noisy in bedroom. But think any fan that would move this amount of air would be noisy. -duct larger than 6”. Had horrible time getting to connect with other pipes Pros: -pushes a lot of air. Can feel the air moving in entire room. Helps get cooler. -fan in noise but sound is more air than motor noise. Feels like pretty solid build. -have used for over a year still working great. Would like to state even with extra noise, would highly recommend this fan. This fan makes our story and half bedroom livable in summer and winter. Without the fan would not be livable. Cheap fix and sure it saves us energy.

I use this to extract heat from a portable A/C unit. I needed a fan with metallic blades due to heat. The heat it is exposed to will warp plastic fan blades. I was worried about the fan motor’s exposure to heat as well. This fan (in my application) is exposed to 145 degree internal duct heat for hours at a time which is right at the end of the motor’s advertised tolerance. It has been working without issues for over two months in Florida weather. I run it for as long as 6 hours straight, as needed. I use this fan to extract exhaust heat from a portable 9000 BTU A/C unit in my garage. This unit may also have use in a hurricane aftermath scenario (as in cooling a tent erected inside the house for sleeping (powered by a gas generator located OUTSIDE), if the power is out for weeks. This fan is hard mounted to a plate which I fabricated which seals the window opening completely. It can be removed from the window in less than 30 seconds. It also locks the window to help avoid entry from outside. I insulated the original flex duct with commercial grade insulation material used for A/C ducts in attics. The portable A/C unit is connected to the insulated duct, and then to this fan assembly at the window plate on the other end. The straight 4 foot duct run has two 45° elbows... this fan creates a vacuum in the duct to draw the heat outside better than the A/C u it could before. These portable A/C units are completely useless unless you facilitate the extraction of the heated air they produce. The uninsulated plastic exhaust ductwork they come with simply transfers all the heat the create right back into the room before it gets outside. It’s so hot in fact, it melts and distorts the window mount that comes with the A/C unit, allowing the heated air to literally blow back into the space you are trying to cool! It would heat and cool the garage simultaneously. Incredibly stupid and costly. To remedy, I insulated the exhaust duct from the A/C unit all the way up the the fan (at the window plate) in order to keep the heat in the duct, and not let it radiate back into the garage airspace. This fan sucks the hot air out. The window/fan mounting plate is made of 3/8 finish grade plywood, and painted with a two part epoxy, as to be waterproof and look nice. The fan is mounted to the plywood with a metal ring I fabricated using rivets, and it seals with a gasket. Control of the fan is manual, via the same power strip that supplies the A/C unit. The sound level is lower than the A/C unit’s noise output. The result: My garage can now reach 78°, with a 50% humidity level on a July day like today. Without the AC, the garage is 85% humidity, and 95°F.