36" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Height_12in Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 17 3/4" x 1"

This 18" X 12" end cap is constructed with 26-gauge galvanized steel

+ Product Details Size - 25"w X 28"h is the size for the duct opening measurement only

Plumbing tubing is measured by it's inside diameter I

+ Product Details Size - 10"w X 14"h X 2"d (for duct opening measurement only)

36" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Height_12in Actual Filter Size – 11+ Product Details Size 36"w X 12"h is the size for the duct opening measurement only, [Outer Dimensions: 38. 5"w X 14. 5"h] Actual Filter Size 35 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,