16"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 9.25"H] 20 Feet Long + Product Details Size -

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

Round-neck-to-square-face construction results in 360 degree air diffusion pattern similar to a full round diffuser

expanding or retracting the gap to meet your precise needs

Actual Filter Size – 19 3/4"w x 9 3/4" x 1"

+ Product Details Size & Compatibility – The 5" galvanized sheet metal round to oval elbow boot is compatible with duct 5"

16"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 9.25"H] 20 Feet Long + 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