20" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES tape accordion-content { padding: 10px 0

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+ Product Details Size – 22"w X 16"h is the size for the duct opening measurement only

Every access panel has a front end frame that will overlap at the wall joint

+ Product Details Size - 36"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – Stick-on collar is 10" and it is compatible with duct 10"

20" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES tape accordion-content { padding: 10px 0+ Product Details Size 20"w X 18"h is the size for the duct opening measurement only, [Outer Dimensions: 22. 5"w X 20. 5"h] Actual Filter Size 19 3 4"w x 17 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,