30"W X 12"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 31.875"W X 13.875"H] 6in diameter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening)

+ Product Details Size - 6"w X 18"h X 2"d (for duct opening measurement only)

+ Product Details Size - 20"w X 6"h X 2"d (for duct opening measurement only)

Easy Installation – Just pop the diffuser right into the wall duct hole and the side springs will hold it right into place so that it looks clean

+ Product Details Size - 12"w X 28"h is the size for the duct opening measurement only

30"W X 12"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 31.875"W X 13.875"H] 6in diameter + Product Details Perfect Fit+ Product Details Size 30"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 31. 875" width X 13. 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