8" BUTTERFLY DAMPER - Control Your Airflow on drop ceiling grilles of 24x24 (8" round duct opening) Grilles /* more readable bullets */

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actual front end outer dimensions are approximately 32 5/8" width X 34 5/8" height

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

actual front end outer dimensions are approximately 32 5/8" width X 16 5/8" height

8" BUTTERFLY DAMPER - Control Your Airflow on drop ceiling grilles of 24x24 (8" round duct opening) Grilles /* more readable bullets */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