16"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 9.25"H] 16" Round Duct Pipe + Product Details Size –

+ Product Details Size – 16"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 20" x 36" or 36" x 20" is the size for the duct opening measurement only

9% pure copper meeting ASTM B280 and C12200 standards

Item Size: 160 x 160 x 85 mm

16"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 9.25"H] 16" Round Duct Pipe + Product Details Size –+ Product Details Size 16"W X 8"H is (for duct opening measurement only); actual front end outer dimensions are 17. 25" Width X 9. 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