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 – 28"w X 22"h is the size for the duct opening measurement only

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

+ Product Description Maximize your home’s airflow with this premium 2-way air supply grille

Design – The stack boot at the bottom of the stack allows a transition from an ordinary large round or rectangular duct to a thin wall-mounted duct

L/H@0 FT: - 22

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