8" BUTTERFLY DAMPER - Control Your Airflow on drop ceiling grilles of 24x24 (8" round duct opening) Grilles + Product Details Size –

+ Product Details Size – 18"w X 20"h is the size for the duct opening measurement only

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+ Product Details Size – 12"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 23 3/4" x 1"

+ Product Details Size – 20" x 20" is the size for the duct opening measurement only

8" BUTTERFLY DAMPER - Control Your Airflow on drop ceiling grilles of 24x24 (8" round duct opening) Grilles + Product Details Size –Control Your Airflow on drop ceiling grilles See our separate listing for T Bar supply grille Check Out This Asin For Matching T Bar Drop Ceiling Grille: B007CNEJZK These are airflow control components made to connect to supply grilles of the drop ceiling, the T Bar vent covers. See our separate listing of T Bar Supply Grilles. Metal Fab A brand you can trust. Some of our best features aren't readily apparent, but youll appreciate the benefits over a