12" X 30" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Drop Ceilings / Steel providing a reliable connection for 4 X 12 Is CRFG2028 Width_14in

providing a reliable connection for 5" round ducts

+ Product Details Size - 32"w X 36"h is the size for the duct opening measurement only

Easy Cutting – Offset and Spring Loaded design for easy

Extra Strong Frame – Our frames are the strongest on the market

+ Product Details Size – 28"w X 24"h is the size for the duct opening measurement only

12" X 30" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER EASY AIRFLOW LINEAR BAR GRILLES Drop Ceilings Steel providing a reliable connection for 4 X 12 Is CRFG2028 Width_14in providing a reliable connection for 5" round ducts + Product Details Size 32"w X 36"h is the size for the duct opening measurement only