20"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 9.25"H] Top Ceiling Box that will overlap at wall

that will overlap at wall joint

the actual front end outer dimensions are 7" in diameter

Applications – The snap collar duct board fitting is used as a main duct or plenum

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

The crank handle lever makes it easy to adjust to every weather situation

20"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 9.25"H] Top Ceiling Box that will overlap at wall+ Product Details Size 20"W X 8"H is (for duct opening measurement only); actual front end outer dimensions are 21. 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