18" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Floor Grille + Product Details Size -

+ Product Details Size - 16"w X 32"h is the size for the duct opening measurement only

ensuring it arrives in perfect condition

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only

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