20" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES w12h12 It has an outer surface

It has an outer surface made of high-quality aluminum foil and an inner surface made of metalized PET with inside high-tensile spring steel wire

3 * Insulation density is 30kgs/CBM = 0

High Quality – Solid rigid steel body for durability and reliability

efficient airflow

20" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES w12h12 It has an outer surface+ Product Details Size 20"w X 20"h is the size for the duct opening measurement only, [Outer Dimensions: 22. 5"w X 22. 5"h] Actual Filter Size 19 3 4"w x 19 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,