10"W X 20"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 11.875"W X 21.875"H] w16h16 Insulation – A thick blanket

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

Actual Filter Size – 17 3/4"w x 5 3/4" x 1"

+ Product Details Size - 24"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 25 3/4"w x 35 3/4" x 1"

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10"W X 20"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 11.875"W X 21.875"H] w16h16 Insulation – A thick blanket+ Product Details Size 10"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 875" width X 21. 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