18" X 16" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 25 Feet Long + Product Details Size &

+ Product Details Size & Compatibility – The galvanized sheet metal oval stack head is compatible with Duct 8"

Actual Filter Size – 31 3/4"w x 31 3/4" x 1"

+ Product Description Enhance your HVAC system with our premium Aluminum Double Deflection Adjustable Air Supply Diffuser

ASTM D1056

+ Product Description Introducing our Ratcheting PVC Tube Cutter

18" X 16" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 25 Feet Long + Product Details Size &+ Product Details + Product Details Size 18"w X 16"h is the size for the duct opening measurement only, [Outer Dimensions: 20. 5"w X 18. 5"h] Actual Filter Size 17 3 4"w x 15 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