40"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 41.25"W x 9.25"H] 12" Round Duct Pipe + Product Details Size –

+ Product Details Size – 18"w X 12"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The size of the side round ceiling box is 10" X 10" X 10" and it is compatible with duct 10"

actual front end outer dimensions are 32" width X 10" height

High Quality – Extra Heavy Duty to withstand constant walk on situations

40"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 41.25"W x 9.25"H] 12" Round Duct Pipe + Product Details Size –+ Product Details Size 40"W X 8"H is (for duct opening measurement only); actual front end outer dimensions are 41. 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