28"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 29.25"W x 9.25"H] Aluminum Adjustable Curved Blade you can make sure that

you can make sure that all your tools will fit

Actual Filter Size – 31 3/4"w x 13 3/4" x 1"

+ Product Details Size - 28"w X 28"h X 2"d (for duct opening measurement only)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 4" duct openings

28"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 29.25"W x 9.25"H] Aluminum Adjustable Curved Blade you can make sure that+ Product Details Size 28"W X 8"H is (for duct opening measurement only); actual front end outer dimensions are 29. 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