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 + Product Details Size -

+ Product Details Size - 25"w X 4"h is the size for the duct opening measurement only

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

also referred to as T-Bar or Lay-in system

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

+ Product Details Size - 22"w X 8"h X 2"d (for duct opening measurement only)

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 + Product Details Size -+ 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