20" X 36" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES R-6.0 insulation and lay it flat in

and lay it flat in the grid

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

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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 14" OR 14" X 16" duct opening (measured at the opening)

20" X 36" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES R-6.0 insulation and lay it flat in+ 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,