VIVOSUN Inline Booster Duct Fan 4” 106 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.

This exhaust fan works great. I have had it and tested it for over a month now. It is very quiet, I wish bathroom motors were this quiet, next the power dial also controls the speed of the fan. the fan speed is completely adjustable this is a HUGE bonus. Most air duct exhaust fans are either on or off, this one has fan speed control. It hooks up pretty easy the length of the cord is about 6 feet which is good. The on off switch is the dial, so the only negative is the switch position. I wish the switch was closer to the outlet and further away from the actual inline booster module.

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.

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

Awesome little inline fan. Used two years so far without an issue

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 have an 800 cfm squirrel cage style blower in my brewery above a pilot system to evacuate heat and steam. The motor can't be exposed to the moisture, so I ducted it through a 4" diameter down-pipe ending a foot above the floor to pull cooler air into the motor. That down pipe proved to be too restrictive to provide enough air to keep the motor from thermal-tripping, so I added this small blower to the down-pipe, and it has made all the difference needed. Where I had been experiencing a couple of motor shutdowns due to overheating on most brewing days, I haven't had any since installing this blower. All that related, this little fan moves just enough air to suffice my needs - it isn't going to impress anyone with the volume it moves. But for an application that doesn't need a lot of air movement, this could work. Cheers!

The fan looks good, fits great, and works. However the speed adjustment does very little to adjust the fan speed. It clicks on to "low" and when turned up just a bit the fan gets faster. But, just above "low" all the way to "hi" the adjustment doesn't do anything, the fan stays the same speed. So, it basically has two speeds, low and hi. It's just a booster fan so I expect I'll always have it on "hi" but I expected a little better adjustment.

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.

A mi me funciona como "inyector" de aire a la carpa y complemento con un extractor en la parte superior. Funciona mejor para ventilar y no para extraer. Ventajas es que tiene 2 niveles de operación, es ligero y puedes colgarlo. Puede adaptarse un tubo e inyectar aire a la carpa o puedes ponerlo directo en la entrada de la carpa si tienes las entradas con el tamaño adecuado. Fíjate bien antes de comprar que diámetro tienen tus entradas de aire. Estaría muy bien que incluyeran algún tipo de colgante o abrazaderas. Por lo demás cumple

No soporta el calor

Bon produit facile a installer. Ce ventilateur est a vitesse basse . Le dimmer sur l appareil est plus ou moins efficace il ne reduit pas assez a mon gout. Pour le bruit moyen si j aurais voulu mieux j aurais payer 200$. Bien conçue solide.

el equipo no aguanta el uso normal que se le da, se dañó a los 2 días de uso