18" X 10" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Copper Coil-Insulated Line Set simply pop the diffuser into

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

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 14" duct openings

Looks like it was just waxed

+ Product Details Size – 20"w X 32"h is the size for the duct opening measurement only

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18" X 10" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Copper Coil-Insulated Line Set simply pop the diffuser into+ Product Details Outer dimensions: 19. 75"W x 11. 75"H fits a 18" X 10" duct opening Durable stamped steel construction ensures long lasting performance Designed for sidewall and ceiling installation with included screws Multi shutter damper with easy lever for precise airflow control Smooth powder coated white finish for a sleek look and scratch resistance + Product Description Maximize your homes airflow with this premium Air Supply Grille air