18"W X 12"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 13.875"H] flat stamped steel Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 12" duct openings

simply pop the diffuser into the wall duct hole and let the side springs hold it securely in place

+ Product Details Size - 20"w X 20"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 28 5/8" width X 20 5/8" height

18"W X 12"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 13.875"H] flat stamped steel Ideal for Walls & Ceilings:+ Product Details Size 18"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 13. 875" height. High Quality High quality aluminum with counter sunk screw holes (screws included) and no sharp edges. Design Unrestricted airflow For Your HVAC system noise free components no vibrating louvers etc. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was