20" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES return grille featuring a 3/8 inch space

featuring a 3/8 inch space between louvers

rust-free aluminum

+ Product Details Size – The size of 4" straight saddle stick on take-off is 10"/12"/14" and it is compatible with duct 4"

+ Product Details Size – 8" x 26" or 26" x 8" is the size for the duct opening measurement only

actual front end outer dimensions are 23

20" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES return grille featuring a 3/8 inch space+ Product Details Size 20"w X 12"h is the size for the duct opening measurement only, [Outer Dimensions: 22. 5"w X 14. 5"h] Actual Filter Size 19 3 4"w x 11 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,