20" X 36" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES R-6.0 insulation + Product Details Size –

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

it provides a seamless solution for noise control

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

Every part is hand inspected for quality before it is packaged

20" X 36" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES R-6.0 insulation + Product Details Size –+ 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,