10" BUTTERFLY DAMPER - For T-Bar, Drop Ceiling Grilles, (10" round duct opening) w20h20 + Product Details Size –

+ Product Details Size – 16"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 23 3/4"w x 19 3/4" x 1"

Actual Filter Size – 29 3/4"w x 17 3/4" x 1"

Actual Filter Size – 21 3/4"w x 15 3/4" x 1"

+ Product Details Size - 25"w X 4"h is the size for the duct opening measurement only

10" BUTTERFLY DAMPER - For T-Bar, Drop Ceiling Grilles, (10" round duct opening) w20h20 + Product Details Size –+ Product Details Size 10" round duct opening Heavy Gauge Steel Heavier gauge than needed, built for durability and long life in mind, but still very thin. Installation Location Ceiling. Design This airflow control component are made to connect to a drop ceiling lay in diffuser grille. Powder Coat Finish smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed. + Product Description Introducing the 6" Butterfly Damper Your Solution