10"W X 18"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 11.875"W X 19.875"H] Insulated Line + Product Details Size – w6h6 actual front end outer MFFG410-1

+ Product Details Size – 18"w X 10"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 30" or 30" x 10" duct opening (measured at the opening)

+ Product Details Size - 10"w X 36"h X 2"d (for duct opening measurement only)

DIY projects

10"W X 18"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 11.875"W X 19.875"H] Insulated Line + Product Details Size – w6h6 actual front end outer MFFG410 1 + Product Details Size – 18"w X 10"h is the size for the duct opening measurement only + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 30" or 30" x 10" duct opening (measured at the opening)