40"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 41.25"W x 5.25"H] Height_14in Applications – Solid stamped steel

Applications – Solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

+ Product Details 18"w X 18"h is the size for the drywall opening measurement only

Looks like it was just waxed

Whether you're updating certain elements of your home or working on new construction

40"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 41.25"W x 5.25"H] Height_14in Applications – Solid stamped steel+ Product Details Size 40"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 41. 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