32" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 34 5/8" X 20 5/8"] Supply Grille actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 36 5/8" width X 10 5/8" height

Design – These are specially sized to fit into all drop ceilings

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

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+ Product Details Size – 20"w X 26"h is the size for the duct opening measurement only

32" X 18" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 34 5 8" X 20 5 8"] Supply Grille actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 36 5 8" width X 10 5 8" height Design – These are specially sized to fit into all drop ceilings