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

I purchased the 4 inch in this model as well. Customer service has been fast to work on issues. My first had to replaced, I reordered the 4 inch again. It works nice, is fairly quiet. Everyone says 4" is perfect for the 4 tier greenhouse. Maybe for plants but not for mushrooms. I ordered this one, the 6" with nearly double the CFM and THAT is perfect for the mushrooms. It is a bit noisier, but eventually I will be able to tune it out. It works perfect and gives me the negative pressure I needed. I put mine to timer, on for 10 seconds, off for an hour, what an improvement in growth! Will definitely get another for back up lol

I bought these to blow air up through new vents that I installed over my wood stove in the basement. The basement would get way too warm and the upstairs was too cold. I cut new vents through the floor and installed new duct work with these fans just before the floor vent. They blow so much warm air upstairs it is unbelievable. My only complaint is that they are a little loud but my main floor is now a comfy 70 degrees F and my basement is still a cozy 75 F. Would definitely buy again.

I use 3 of these in my heating ducts to help move air over long runs. First, the install was fairly simple (though I had to cut the wires for hard wire install, not plugging them in). The plug allowed me to test each fan before install, which was nice. The crimped end was not really crimped much. The wavy look was deceiving, I had to bend them in slightly. When I checked with a 6" duct, they were identical, until I bent them in. Finally, the fans themselves are not too noisy. However, when you consider moving air at a higher volume down a long run of 6" ducting, it sounds like a turbo in a big truck. They are pretty noise from that aspect. Just be aware.

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.

It's louder than my box fan BUT it is no longer hot upstairs. Good trade off in my opinion. I don't need to supplement my HVAC with air conditioners anymore which were also loud but worse they shut off and on all night. At least this fan is a constant sound. I only plan to use this product on really hot or cold days to help my HVAC reach upstairs. It was over 100 yesterday but upstairs was comfortable without using window air conditioners. I have it plugged into a timer so I don't have to go in the basement to turn it off and on. It turns on 2 hours before bed and runs all night. I am happy with it, a VERY cheap way to help boost the HVAC on these hot days. My electric bill last month was higher than Snoop Dogg, I know this months bill will be much nicer without the extra air conditioners and box fans running. I look forward to the boost this winter too, Michigan winter's can be brutal!

Runs ok, moves a decent amount of air, seems to be well constructed. However, i am measuring 65 dba on the outlet side at 6 inches and 78 dba on the inlet side at 6 inches, well above the claimed 37decibels. I am using this in a dog kennel and bought it because of the low noise rating. probably will be returning this fan.

Works good, but there is no black-flow preventer. Not a problem though.

Used as a air supply to a grow tent. It worked great until it didn't. 4 months of use! Heard a loud noise from the grow room and when I investigated I found the fan making an odd sound. Turned it off and removed it and found the fan blade had come off. I tried to put it back on but it appears the nut was initially stripped during the factory install and wouldn't go back on. May be fixable if I can find a nut to fit the shaft. Luckily the shaft is stronger than the nut and isn't stripped. Giving 1 star because this shouldn't happen and if it's not fixable it's a paper weight after 4 months of use.

Using to move air from an overly hot room in my basement into a colder laundry room. It moves the air well with not a lot of noise. Most of the noise is from the air rushing out. The 6" flexible vent hose fit well and was simple to install. There is not switch, just a direct power cable and plug. I use a smart switch to control it based on the weather. I used the suggestions in another review to reduce any noise: I hung the fan and hose from bungee cords. I put 2 small hooks in the ceiling on either side and looped a cord between them along the length of the run. The pipe and fan sits inside these 'cradles'. It is in the basement below my bedroom (no insulation between) and I can barely hear it. The laundry room is toasty warm now.

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.

Works perfectly as a fireplace fan, forcing hot air through the passive ducts. There's some low level noise but not enough to annoy. There's no way to vary airflow so running it off a dimmer switch would probably be the best solution. Update: after less than 150 hours of usage over one year, the fan stopped working. Close inspection shows absolutely no sign of stress or damage, I've examined the installation space and ambient temperature is around 24 degrees C. It draws cold air from the basement into the fireplace ducting system. Very disappointed. Contacted Vivosun and they replaced the fan at no cost. Very impressed with their responsiveness, but having narrowed down the malfunction of my fan to the dimmer I was using, I believe there's much room for improvement in their instructions. This fan uses a brushless motor and many dimmers will potentially damage it. Finding one that won't is a challenge, since none of the manufacturers I've contacted (nor Vivosun for that matter) will give a straight answer. See my comments in the questions and answers section. One warning regarding your dealings with this company: DON'T get onto their mailing list. I've tried several times to get off it and still get about a dozen of so emails per month from them.

Hace ruidoo

Perfect fan for my garage ventilation install. Just needed to give the one end a tweak to fit 6" duct over it, the other a 6" union solved it. The only noise I hear with an attic install is the whoosh of air from the ceiling.