34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 12" Or 12" x 34" duct opening (measured at the opening)

These are specially sized to fit into all drop ceilings

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+ Product Details Size – 20"w X 4"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 13 3/4" x 1"

34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in + Product Details Perfect Fit & Easy Sizing Designed for a 34" x 12" Or 12" x 34" duct opening (measured at the opening) These are specially sized to fit into all drop ceilings