20"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 7.25"H] Aluminum - Cube Core as it can be mounted

as it can be mounted on drywall

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 8" duct openings

For 10" duct opening

+ Product Details Size - 28"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 32" x 36" or 36" x 32" is the size for the duct opening measurement only

20"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 7.25"H] Aluminum - Cube Core as it can be mounted+ Product Details Size 20"W X 6"H is (for duct opening measurement only); actual front end outer dimensions are 21. 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