20" X 36" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Ductwork + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 12" OR 12" x 30" duct opening (measured at the opening)

these heavy-duty louvers are ideal for use in attics

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+ Product Details Size - 20"w X 14"h X 2"d (for duct opening measurement only)

875" width X 26

20" X 36" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Ductwork + Product Details Perfect Fit+ Product Details Size 20"w X 36"h is the size for the duct opening measurement only, [Outer Dimensions: 22. 5"w X 38. 5"h] Actual Filter Size 19 3 4"w x 35 3 4" x 1" High Quality High quality rust free, strong aluminum construction with smooth finished edges for easy and safe use; Filter grille features a user friendly plastic latch that requires no screwdriver for opening. Installation Location Sidewall and ceiling. Design Heavier gauge than needed,