20"W X 16"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 17.875"H] Supply Grille + Product Details Size -

+ Product Details Size - 32"w X 36"h X 2"d (for duct opening measurement only)

High Quality – Solid rigid steel body for durability and reliability with dampers operable by switch for airflow directional control

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 36" duct opening (measured at the opening)

Actual Filter Size – 23 3/4"w x 9 3/4" x 1"

+ Product Details Size - 36"w X 12"h is the size for the duct opening measurement only

20"W X 16"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 17.875"H] Supply Grille + Product Details Size -+ Product Details Size 20"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 875" width X 17. 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