48"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 49.25"W x 7.25"H] 14in diameter + Product Details Size - FLTR M8 308x3 Actual Filter Size 23 Drop Ceilings / Aluminum

+ Product Details Size - 34"w X 16"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 10" X 4" X 4"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 18" or 18" x 8" duct opening (measured at the opening)

+ Product Description Introducing Our Professional Aviation Snip Set - Your Cutting Essentials

This set comes in a well-padded carrying case for easy portability and organization

48"W X 6"H [Duct Opening] Linear Aluminum Clip On Bar Return Air Grille [Outer Dimensions: 49.25"W x 7.25"H] 14in diameter + Product Details Size FLTR M8 308x3 Actual Filter Size 23 Drop Ceilings Aluminum + Product Details Size 34"w X 16"h is the size for the duct opening measurement only + Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 10" X 4" X 4"