18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 14" Round Duct Pipe + Product Details Size &

+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 10" X 6" X 4"

Enhanced Filtration: Our filters are 25% thicker than competitors'

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 30" OR 30" x 28" duct opening (measured at the opening)

+ Product Details Size - 22"w X 30"h is the size for the duct opening measurement only

Extra Strong Frame – Our frames are the strongest on the market

18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 14" Round Duct Pipe + Product Details Size &+ Product Details Size 18"w X 20"h is the size for the duct opening measurement only, [Outer Dimensions: 20. 5"w X 22. 5"h] Actual Filter Size 17 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,