20"W X 40"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 41.875"H] Width_20in + Product Details Size -

+ Product Details Size - 14"w X 6"h Is The Size For The Duct Opening Measurement Only

then you'll need a 14-inch round vent

actual front end outer dimensions are approximately 34 5/8" width X 10 5/8" height

+ Product Details Size - 10"w X 10"h X 2"d (for duct opening measurement only)

+ Product Spec Sheet Return Air Grille Spec Sheet

20"W X 40"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 41.875"H] Width_20in + Product Details Size -+ Product Details Size 20"w X 40"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 875" width X 41. 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