16"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 5.25"H] Height_22in + Product Details Size –

+ Product Details Size – 24"w X 18"h is the size for the duct opening measurement only

Rule of Thumb: "HVAC" nominal tube sizing 1/8

including round exhaust air duct systems for dryers

The aluminum and gypsum construction makes it impervious to moisture

much more than the required 700 psi for r410

16"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 5.25"H] Height_22in + Product Details Size –+ Product Details Size 16"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 17. 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