Quiet Register Booster Fan 4”×10”, Smart Register Vent with Intelligent Thermostat Control, Cooling Heating AC Vent Booster Fan, Matte White

Very good product! We use it to pull air from our wood heater in the basement, we have tried a couple of other brands, but they do not rate like this one. Simple to use, very well built, and it moves a lot of air. We do not use it in a vent, but i can see how un-obstructive it would be to the air coming from the HVAC Large opening for the air to pass through, and runs very quietly compared to the others we have. We will be replacing the other brands with this one. :)

Bought this for the vents in a couple rooms in my house, that have poor vent performance. Didn't realize that the inside dimensions of my vents are all 3" by 10", though, so they didn't fit (the inner dimension of your vent does indeed need to be 4x10 to work with these). Plugged it in to test out the performance any way, and: - VERY quiet - Fan seems pretty strong Hard to say exactly how it would have performed if it fit into my vent (and they don't make a 3x10 version that I could find) but worth giving a try if you do have 4x10 vents!

It works great. Great company , I have used Vivo sun products for years . Great customer service. I see some complaints about fan noise . That’s ridiculous. It’s two high powered fans that are in a vent . On highest setting it’s not even that bad but will make some noise. Works great. We have a back bedroom that doesn’t get good airflow this solved the problem and saved the day going into summer . Also in my experience with electronics , keep it simple . Just use the fan. If fans with other bells and whistles are constantly turning on and off there are more opportunities for something to fail and then cause catastrophic failure in equipment. I need airflow so I just keep it on high fan setting and leave it alone .

This actually works. When the furnace is on it increases the flow of air into the room and when furnace is not on it continues to pull the warm air into the room to the preset parameters. I’m not waking up at night to turn on my heating pad or electric fireplace. It did take several tries to change from Fahrenheit to Celsius. You have to press the up/down buttons at exact same time and it will eventually switch over. Very pleased with this purchase.

Works Great