20x6 Return Air Grille(Duct Opening Size),Outer Dimensions:21.75"W x 7.75"H,Flat Return Air Grilles,Air Vent Covers,AC Return Vent Cover,Vent Covers for Wall,Modern Vent Covers for Home Ceiling,Return Air Vent Cover Features: ?Return air grille used for sidewall or ceiling openings. High-quality solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges for easy installation. ATTENTION: This is a flat stamped steel return air grille. Please order by the duct opening measurement. Before buying, ensure precise fitting by measuring your wall opening before placing your order. Wall Opening Size = Listed Size. If the duct opening on the wall is 20"W x 6"H please order (20"W x 6"H, Duct Opening). 20"W x 6"H is the size for the duct opening measurement only, actual return air grille outer dimensions are 21.75"W x 7.75"H. ?With its easy installation and easy to operate, this 20x6 vent cover can be quickly and securely mounted to your wall or ceiling for instant improvement in airflow and circulation. Our return air grilles can help circulate air in residential and commercial buildings. Cold air return vent cover can also be used to circulate cool air between different rooms in your home. ?Using only the finest materials and the latest manufacturing techniques, our return air grill set out to create the best HVAC grilles and registers on the market. Whether you're looking to upgrade your home's HVAC system or simply want to enhance the look of your air conditioning units, our air return grill has you covered. Specification: -Material: Heavy Duty All-steel construction. Durably white powder coated. -1/2" spaced fins set at 40 degrees. -Primary use: Side wall and ceiling. -Screws are included with the system, standard. -Concealed mounting holes. Package includes: 1 * 20x6 return air grille How to Measure for Return Air Grill: 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 - Take the correct measurements Measure the Duct Opening (the hole on the wall/ceiling) by measuring the WIDTH first:20", and then the HEIGHT:6" (e.g. 20"W x 6"H), please order (20"W x 6"H, Duct Opening) this HVAC return air grille is the size you should order. ONLY MEASURE THE DUCT OPENING, DO NOT MEASURE YOUR OLD GRILLE! Note: 1. Please allow 0-0.4 inch error due to manual measurement. Please make sure you do not mind before you bid. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the return vent. Thank you!