20"W X 24"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 25.875"H] 12in diameter scratch-resistant surface that gleams like

scratch-resistant surface that gleams like it's just been waxed

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

Actual Filter Size – 35 3/4"w x 5 3/4" x 1"

Actual Front End Outer Dimensions Are 5

Actual Filter Size – 17 3/4"w x 25 3/4" x 1"

20"W X 24"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 25.875"H] 12in diameter scratch-resistant surface that gleams like+ Product Details Size 20"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 875" width X 25. 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