20x8 Return Air Grille (Duct Opening Size), Outer Dimensions: 21.75"W x 9.75"H, Air Return Vent Cover, Flat Return Air Vent Cover, AC Return Vent Cover, Cold Air Return Vent Cover, Wall Vent Cover, Return Vent Covers for Home Wall Features: ? This is a flat stamped steel return air grille. Please order by the duct opening measurement. (ONLY MEASURE THE DUCT OPENING, DO NOT MEASURE YOUR OLD GRILLE! ) How to Measure for Your Return Air Grille: Measure the Duct Opening (the hole on the wall/ceiling) by measuring the WIDTH first: 20", and then the HEIGHT: 8" (e.g. 20"W x 8"H), please order (20"W x 8"H, Duct Opening). This HVAC return air grille is the size you should order. ? Constructed from high-quality, solid stamped steel, this vent cover is built to endure. Scratch-resistant powder coat finish that withstands temperature fluctuations and daily use without warping, chipping, or fading. ? Engineered with fixed, 40-degree angled fins and 1/2-inch spacing, this return air grille cover promotes maximum, unrestricted airflow while minimizing noise and vibration. Specification: - Design: Flat profile return air grille - Material: Heavy duty solid steel, durable powder coated - Duct Opening Size: 20"W x 8"H - Overall Grille Dimensions: 21.75"W x 9.75"H - Fin Design: 1/2" spaced fins set at a 40-degree angle - Primary Use: Side Wall and Ceiling (Return, Supply Applications) Package includes: 1 * air return vent cover 20x8 1 * set of mounting screws - Flush-mount Installation: Step 1 - Remove your old grille. Remove the screws that secure the grille onto the wall/ceiling. If this is a ceiling application, prevent the grille from falling for your safety. Step 2 - Counter-sunk screw holes and no sharp edges ensure safe and easy handling. With included screws and concealed mounting holes, installation on any sidewall or ceiling is simple. Note: 1. Please allow a slight size variation of 0-0.4 inches due to manual measurement. 2. Due to lighting and monitor display differences, the actual product color may vary slightly from the images.