18 in. Downdraft Evaporative Cooler Barometric Damper - 17.75 x 17.75 in.

(6 reviews) Write a Review
SKU:
DD1775
Weight:
5.00 LBS
$90.00

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Description

Automatic barometric damper for compatible downdraft evaporative cooler duct installations.

Specifications & Compatibility

  • Nominal cooler duct size: 18 x 18 inches
  • Actual listed damper size: 17.75 x 17.75 inches
  • Airflow configuration: downdraft
  • Frame and vanes: high-grade aluminum
  • Hinges: nylon
  • Weatherstripping insulation helps form a thermal seal
  • Operation: opens automatically during cooler airflow and closes when the cooler is off
  • Listed application: 18-inch roof jack for compatible 4,500 CFM evaporative coolers

Installation & Use

For compatible 18-inch evaporative cooler roof jacks. Measure the available opening and confirm the required airflow direction and mounting orientation before ordering. Use the downdraft version for the matching installation.

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6 Reviews

  • 5

    18" Downdraft Barometric Damper

    Posted by Edward on Jul 16th 2025

    Very convenient in that I can turn on my a/c remotely on more humid days and not have to put in the old damper plate. It seems to block the majority of backflow when the a/c is on.

  • 5

    18" DOWNDRAFT BAROMETRIC DAMPER - 17.75" X 17.75" DD1775

    Posted by Charles on Jun 13th 2025

    This is the right part for the Dial Evap roof jack.

  • 5

    18" Downdraft Barometric Damper

    Posted by Eder Ontiveros on Aug 2nd 2023

    Got tired of shutting off the duct manually. This is what I was looking for without knowing if it even existed. Lightweight yet very sturdy. The vanes are well balanced and efficient.

  • 5

    18" DOWNDRAFT BAROMETRIC DAMPER

    Posted by Jim Hyde on May 11th 2023

    Just what I wanted.

  • 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.

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