12"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 13.25"W x 5.25"H] return grille Our elbow couplings are constructed

Our elbow couplings are constructed to be smooth and seamless to create a leak-proof connection

Applications – The galvanized steel metal round duct is used to cut into a plenum or rectangular duct to begin a trunk line or branch-like runs

+ Product Details Size - 16"w X 28"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 30" Or 30" x 34" duct opening (measured at the opening)

12"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 13.25"W x 5.25"H] return grille Our elbow couplings are constructed+ Product Details Size 12"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 13. 25" Width X 5. 25" Height. Design Designed for concealed, flush placement on your wall with a 3 8 inch space between louvers, this linear grille comes with an installation frame and clips for easy hook in assembly, ensuring a refined and seamless look. High Quality Aluminum The premium durable aluminum will never rust and it will never