18" X 24" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Custom Louvers + Product Details Size -

+ Product Details Size - 36"W X 4"H is (for duct opening measurement only)

+ Product Details Size – 22"w X 22"h is the size for the duct opening measurement only

Just snap the seam together and that's it

+ Product Details 90° Vertical Bend – Immediately Improves the appearance of mini-split

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18" X 24" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Custom Louvers + Product Details Size -+ Product Details Size 18"w X 24"h is the size for the duct opening measurement only, [Outer Dimensions: 20. 5"w X 26. 5"h] Actual Filter Size 17 3 4"w x 23 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,