36"W X 10"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 37.875"W X 11.875"H] 8" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 14 5/8" width X 18 5/8" height

expanding or retracting the gap to meet your precise needs

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 4" duct openings

Actual Filter Size – 24 3/4"w x 13 3/4" x 1"

+ Product Description Upgrade your ventilation with our premium grilles and registers

36"W X 10"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 37.875"W X 11.875"H] 8" Round Duct Pipe actual front end outer dimensions+ Product Details Size 36"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 37. 875" width X 11. 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