Spring Loaded Backdraft Dampers

Backdraft dampers.  Constructed from galvanized steel for the collar and lightweight aluminum for the damper blades. Spring loaded for positive closure.

Can be mounted horizontally or vertically -- horizontal or vertical (up) airflow.  The collars are undercut 1/8" to fit duct (12" size is 1/4" undercut).

model description usually ships price QTY
BDD12 Spring loaded backdraft damper with foam gasket. For 12" round duct. 1 Day. In-stock $18.00
add to basket

real-time shipping quotes are available before checkout on your shopping cart page


backdraft damper

metal backdraft damper

Do you have questions about the products on this page?

Click on the ? image on the left or this link to ask us your questions!
#1 Q:   Can you tell me how many CFMs are required to open these dampers.
A:   There is no testing data for min CFM to open these. Sorry. The springs are sized for typical flow in ducts.

       Asked on 2019-06-25 by Joe
#2 Q:   Can this be used in a vertical - airflow down position?
A:   No. Only vertical orientation that will work is airflow up.

       Asked on 2019-01-05 by Glen
#3 Q:   Can this product be used on a range hood blower to prevent cold air from entering house via the duct work? The blower installed is a 600CFM.
A:   Yes. These can be used for bath or kitchen exhaust systems.

       Asked on 2018-12-06 by David
#4 Q:   Do you have a damper sensitive enough to be opened by a computer fan? We need a very small ventilation source for a cold storage unit that will be operating on DC, and want to have the intake closed when the fan is not operating.
A:   No, you would probably need more flow/pressure than a computer fan will provide. Consider a motorized damper with the same voltage as the fan (or from main power source for the fan), so powering the fan will power the damper open.

       Asked on 2017-07-28 by ZD
#5 Q:   Could you use on dryer vent?
A:   Not recommended. In general, any backdraft damper with a center pivot is not recommended as they tend to collect lint there.

       Asked on 2016-12-03 by Jim
#6 Q:   Is there a noticeable reduction in air flow, specifically if I use two?
A:   You can expect a slight increase in static pressure, but it is almost negligible when using a high statich centrifugal fan.

       Asked on 2014-03-14 by Jeff S
#7 Q:   What is the temperature rating for this product?
A:   The top rating for this is 140 degrees F.

       Asked on 2014-01-03 by Mike

Related Products

Fantech RSK Backdraft Dampers

Backdraft dampers with galvanized steel collar and lightweight aluminum damper blades. Spring loaded for positive closure.


why buy from us?

We're engineers passionate about home ventilation and serious about customer service – so you can count on us for carefully-selected equipment and expert advice to ensure your project is a success from specification to installation.

Your call is answered by qualified people who will gladly discuss your project in detail, advise you professionally and never sell you inappropriate products.