They use both an embossed bead and rubber gasket to help keep ducting securely in place. Saves CO2 and prevents odors from flowing backwards. They prevent back draft and contaminated air when your fans are off.

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Weight	N/A
Size in Inches	4 in, 6 in, 8 in, 10 in, 12 in

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Heavy Duty Backdraft Damper

$14.95 – $26.95 Select options

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