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] 10" Round Duct Pipe Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 31 3/4" x 1"

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

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Product Details Size - 6"w X 36"h X 2"d (for duct opening measurement only)

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] 10" Round Duct Pipe Actual Filter Size – 17+ 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