12" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES w10h10 + Product Details Size -

+ Product Details Size - 4"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 24"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 4"w X 30"h is the size for the duct opening measurement only

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

+ Product Details Size – 3"w X 10"h or 10"w X 3"h is the size for the duct opening measurement only

12" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES w10h10 + Product Details Size -+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, [Outer Dimensions: 14. 5"w X 14. 5"h] Actual Filter Size 11 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,