8"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 9.25"W x 5.25"H] 9" Diameter + Product Details Size -

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

+ Product Details Size & Compatibility – The size of the side round ceiling box is 12" X 12" X 5" and it is compatible with duct 5"

+ Product Details Size - 34"w X 26"h X 2"d (for duct opening measurement only)

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With its spring-loaded locking mechanism

8"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 9.25"W x 5.25"H] 9" Diameter + Product Details Size -+ Product Details Size 8"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 9. 25" Width X 5. 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