36" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 20 Feet Long + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 16"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 36"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 34" OR 34" X 14" duct opening (measured at the opening)

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Crafted from solid stamped steel

36" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER EASY AIRFLOW LINEAR BAR GRILLES 20 Feet Long + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 16"w X 18"h is the size for the duct opening measurement only + Product Details Size 24"w X 36"h X 2"d (for duct opening measurement only)