18"W X 24"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 25.875"H] Blade Design – removable frame for 4 X 12 Is CRFG2028 Width_14in

Design – removable frame for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Size - 18"w X 26"h X 2"d (for duct opening measurement only)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 8" duct openings

Filter Size - 13

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 16" Or 16" x 34" duct opening (measured at the opening)

18"W X 24"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 25.875"H] Blade Design – removable frame for 4 X 12 Is CRFG2028 Width_14in Design – removable frame for easy filter change & cleaning uses a 1" thick filter + Product Details Size 18"w X 26"h X 2"d (for duct opening measurement only)