48"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 49.25"W x 9.25"H] w36h36 + Product Details Size –

+ Product Details Size – 25"w X 14"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 28"h is the size for the duct opening measurement only

Designed for a 1" thick filter

Applications – The straight boot is used for the transition from round pipe or insulated flex duct to register or grille

48"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 49.25"W x 9.25"H] w36h36 + Product Details Size –+ Product Details Size 48"W X 8"H is (for duct opening measurement only); actual front end outer dimensions are 49. 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