20"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 5.25"H] Compatible with Duct 10" this stick-on collar with damper

this stick-on collar with damper efficiently facilitates the delivery and removal of air

+ Product Details Size – 6" x 30" or 30" x 6" is the size for the duct opening measurement only

designed for superior airflow (up to 95%) and easy filter access

Screws Included - Easy Unrestricted Air Flow For Your HVAC System

20"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 5.25"H] Compatible with Duct 10" this stick-on collar with damper+ Product Details Size 20"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 21. 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