40"W X 20"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 41.875"W X 21.875"H] Color_Red Oak + Product Details Size – w6h6 actual front end outer MFFG410-1

+ Product Details Size – 24" x 36" or 36" x 24" is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 29 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 30" duct opening (measured at the opening)

+ Product Details Size - 30"w X 30"h is the size for the duct opening measurement only

40"W X 20"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 41.875"W X 21.875"H] Color_Red Oak + Product Details Size – w6h6 actual front end outer MFFG410 1 + Product Details Size – 24" x 36" or 36" x 24" is the size for the duct opening measurement only Actual Filter Size – 21 3 4"w x 29 3 4" x 1"