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

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.

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.

the fan moves a lot of air, and the speed control is reasonably linear allowing for smooth speed adjustments thought-out its range without any spots that seem to not make much difference. it doesn't come with any means of attaching or hanging it at all, no strap, nothing!!! i grow veggies in the tent rather than weed like most here so i have no need for a carbon filter and a strap or mounting bracket would of been a nice addition. it's reasonably light weight so i installed it into one of the vent openings of a grow tent and just used the synch cords to secure it, it works well. i have it just to help with heat removal in the top of the tent when the lights are on, i keep the lower vents of the tent open all the time so there's a bit of natural thermal lift, but on hot days i had a little more temp climb than i liked. i have noticed that the room i have the tent in gets a good bit warmer with the tent venting into it so i have a 16ft 6" hose and it fit the fan perfectly, and i'll get a window vent to vent the heat outdoors. other than it being a bit noisy, it's a great addition to the grow tent.

Excellent fan. The motor is not too loud. It pushes great airflow. It's all metal construction and proven fan technology Ensure it will work for years to come.

Get the metal corded one in this product. I had connection issues with the power converter on the plastic one. It worked well, but the connection wasn’t solid causing it to start sputtering. I exchanged for the corded metal one and it is a powerhouse and well worth the purchase price.

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.

As an Old head, a lot has changed in 6 years. Quieter and more efficient. Good vpd and displacement.

Alittle bit loud but honestly works well, and easy to install