18" X 16" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Side Out Ceiling Register Box + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 14" or 14" x 12" duct opening (measured at the opening)

and the full outer portion is double layered

Applications – The C-box duct with drywall flange

+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 12" X 6" X 6"

18" X 16" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Side Out Ceiling Register Box + Product Details Perfect Fit+ Product Details + Product Details Size 18"w X 16"h is the size for the duct opening measurement only, [Outer Dimensions: 20. 5"w X 18. 5"h] Actual Filter Size 17 3 4"w x 15 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