Motorized Dampener Help please

[AlaskanGrower]

Any advice on motorized dampeners? I need one that I can wire in or plug in that well open when my thermostat tells it to. Trying to better block the cold outside air when my intake fan is not running. Also I'd prefer one that opened quickly so as not to restrict and over work my fan. I say this because I was looking into hVAC motor dampeners and they were saying 90 seconds to fully open??? That's way to long

 

[callahanman]

Any advice on motorized dampeners? I need one that I can wire in or plug in that well open when my thermostat tells it to. Trying to better block the cold outside air when my intake fan is not running. Also I'd prefer one that opened quickly so as not to restrict and over work my fan. I say this because I was looking into hVAC motor dampeners and they were saying 90 seconds to fully open??? That's way to long

Ok first of all to keep controls simple look for a damper that takes the same voltage to operate as your fan. Let's say that is 120 volts. Your damper should open with current applied and shut with a spring. Wire it in with the fan so fan on = damper open. Fan off will = damper closes. Would not worry too much about the open/close times, yeah 90 sec to open fully sounds bad. However that means it will open partially in just a few secs. 120v motors will prob be faster than that.

You may want to search instead for a backdraft damper. They are spring loaded or gravity operated. Prob a better solution for you, works with air pressure and closes automatically. Using two of the gasketed types inline would block outside air very well, at the cost of loading your exhaust fan a little to generate the air pressure.

Hope I could help

 

[callahanman]

Prob not the right sub for this, mods will most likely move this.

 

[Holdin']

Callahanman is correct - if what you are trying to achieve is preventing cold outside air from entering while the fan is off (backdraft) - then a backdraft damper is much more simple, no wiring or controls required, and cheaper.

And for the record, with all due respect, it's "damper" not "dampener"

Also for the record, most motorized dampers open within ~5-10 seconds tops, 24v.

Cheers and good vibes to you.