VIVOSUN Inline Booster Duct Fan 8” 430 CFM with Speed Controller, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens, Attics, Grow Tents

Very happy with this product. I installed it into a green house connected to a thermostat and ran the supply off of a HVAC leg. With the air hepa filtered on the unit and the house temp at a constant 70/71, when it calls for cooling the fan pulls that extra air in with the adjustable speed and power to move cool air in. Easy to install, works great, and Vivosun Quality as always.

I was extremely happy with this product I did expect it to be the size that it was and it was which is sometimes surprising. The power that this thing has the fan to suck the air from one part of the house to the other is absolutely wonderful I use it for my attic space to keep the hot air out in the summertime.

I'm questioning whether there is something wrong with this fan. It works but it is very loud. I found that a wire from the motor was looped up and touching the fan blade. I pushed it down with hemostats. The fan runs quiet as expected now.

Worked like a charm. Needed to improve airflow in my drying tent - this made that happen

Vivosun is a great company to deal with. Awesome customer support. I installed this in my dryer exhaust line and it has sped up my dry time. Fan runs quiet and every efficient. Can’t go wrong with this product.

The first fan ordered did not work as it should - when turning the controller knob, there is a humming noise like a voltage transformer and the blades hardly move. Then suddenly in some position the fan turns on at full power and makes quite a lot of noise, about 28 decibels - it's nothing. Turning the regulator knob to maximum turns the fan off. I thought I had gotten a defective fan and decided to replace it with another one of the same kind, so to speak, to give the company a chance. However, the second one has exactly the same problem. Too bad, the window insert for the 4” vent from this company is quality, no complaints.

I bought this to improve airflow between my basement and main floor, but I found that it was too noisy, even on the lowest setting. I know it gave the decibel rating, but it's hard to know just how noisy that is in real life. I couldn't talk over the noise this fan put off. If you're using it in a duct that is far away from living areas, it might be just fine.

I live in a high moisture state so I have very high humidity and I have a small tent that’s about 3 x 2 1/2 x 5 1/2‘ and this little fan was not enough to completely manage this tent, but it did cool the tent off by itself Wasn’t strong enough so I ended up buying a viva sun in-line fan instead of returning this little fan I kept it and now I use it as a nonpassive when needed and that it works perfectly it’s light so I literally installed it directly in the vent of the temp since I have two clamping sites on the temp and hold it perfect and That’s it 2426 bucks totally worth it, but I would say don’t think it will be your final solution if you live in a humid climate

The build quality isn't amazing. It was very cheaply put together. I had purchased two; one worked, and the other didn't start. I will not be purchasing them again.

Se ve y se siente la calidad en los materiales, hace muy poco ruido a maxima potencia aunque me hubiera gustado que tuviera más potencia pero cumple.

buena calidad

Très satisfait très silencieuse je l ai installer dans mon plancher pour faire monter la chaleur de mon poele a bois j en ai acheté 2 ! Très satisfait marche a toute les jour du matin au soir pas un mot a dire

We are using this in our sauna wall to vent out and it works great, moves a good amount of air and is quiet.