20" X 25" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES tape + Product Details Perfect Fit 4" Round Duct Pipe Product Details Size The SHEASC10W1-HP

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 22" OR 22" x 30" duct opening (measured at the opening)

it is concealed and impenetrable

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 18" or 18" x 10" duct opening (measured at the opening)

+ Product Details Size – 16"w X 20"h is the size for the duct opening measurement only

Its sturdy construction guarantees a smooth

20" X 25" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER EASY AIR FLOW LINEAR BAR GRILLES tape + Product Details Perfect Fit 4" Round Duct Pipe Product Details Size The SHEASC10W1 HP + Product Details Perfect Fit & Easy Sizing Designed for a 30" x 22" OR 22" x 30" duct opening (measured at the opening) it is concealed and impenetrable