12"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 12.25"W x 7.25"H] Compatible with Duct 7" + Product Details Size &

+ Product Details Size & Compatibility – The 4" stick-on Side take-off is compatible with duct 4"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 18" OR 18" x 22" duct opening (measured at the opening)

Crafted from high-quality C12200 copper

75"H – fits a 16" X 8" duct opening

Rule of Thumb: "HVAC" nominal tube sizing 1/8

12"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 12.25"W x 7.25"H] Compatible with Duct 7" + Product Details Size &+ Product Details Size 12"W X 6"H is (for duct opening measurement only); actual front end outer dimensions are 13. 25" Width X 7. 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