20" X 8" motorized damper - normally open
Jackson Systems "D" Series motorized rectangular zone dampers are designed especially for use in zone control, air inlet, and exhaust air vents, although they may be used to control air flow in any duct system. These dampers are powered closed/spring return open.
The powered closed/spring return open version is 2-position, 15 seconds close with power on, and 5 seconds spring open with power off.
Reviewed by 1 customer
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Comments about 20" x 8" Motorized Damper by Jackson Systems D-2008-BM:
Used this to automatically close off ducts that feed the majority of the house with AC at night, so the master bedroom gets cool and dehumidified (second story master) without having to cool the entire house. Fantastic, couldn't work better. Had I known these were available I would have put more in when we built. I was worried about rattling either when open or closed but no problems either way. Clean. What a great line up of products. Never figured anyone would have all the configurations, tall, wide and different dimensions in stock. Wow, in stock and on my doorstep in no time.