10"W X 4"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 11.875"W X 5.875"H] 12" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 30 5/8" width X 36 5/8" height

Actual Filter Size – 29 3/4"w x 27 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 8 5/8" height

+ Product Details Size - 6"w X 30"h X 2"d (for duct opening measurement only)

+ Product Details Size - 36"w X 10"h X 2"d (for duct opening measurement only)

10"W X 4"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 11.875"W X 5.875"H] 12" Diameter actual front end outer dimensions+ Product Details Size 10"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 875" width X 5. 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