18" Downdraft Barometric Damper - 17.75" x 17.75" DD1775

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5.00 LBS
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Product Overview

17.75" Barometric Damper automatically opens when cooler is on and closes off the duct when cooler is turned off. High grade aluminum frame and vanes with nylon hinges and weatherstripping insulation for thermal seal. Fits 18" cooler roof jack for 4500 CFM coolers.


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  • 5
    Barometric louvers

    Posted by David Banks on Nov 19th 2020

    Worked great and great quality

  • 5
    Is exactly what I needed, fits perfectly.

    Posted by Paul Woodworth on May 15th 2020

    For preventing backdraft into swamp cooler where heating and cooling systems use same duct work. Permits using both hear and A/C without shutting something down.