6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 14" duct openings

+ Product Details Size – 20"w X 20"h is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 14" Width X 8" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

Roundover Beveled Edges

Its generous size and universal design ensure a perfect fit for a wide range of thermostat models

6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper Ideal for Walls & Ceilings:+ Product Details Size 6" x 36" or 36" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 37. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing