36"W X 20"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 37.875"W X 21.875"H] 1-Way Enhanced Filtration: Our filters are 4 X 12 Is CRFG2028 Width_14in
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Description
36"W X 20"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 37.875"W X 21.875"H] 1 Way Enhanced Filtration: Our filters are 4 X 12 Is CRFG2028 Width_14in Enhanced Filtration: Our filters are 25% thicker than competitors' + Product Details Size 14"w X 8"h is the size for the duct opening measurement only