HOW TO MEASURE - Always measure the wall opening to determine which size you should order. Wall Opening Size = Listed Size. If the duct opening on the wall is 12" W x6" H please order 12"x6" size option. The outer dimensions of the grille are 1.75" wider. Handua return air grille used for sidewall or ceiling openings. | HIGH-QUALITY MATERIALS - Made of high quality steel with durable powder paint coated, this cold air return cover ensures robustness and long-lasting performance. The steel is stamped so there is no sharp edges. Its sturdy construction ensures long-term durability, making it a reliable choice for both residential and commercial applications. | EFFICIENT AIRFLOW - Enjoy a quiet and efficient airflow for your HVAC system with our vent cover. 40 degree angled fins ensures maximun airflow. It is designed to minimize noise while maximizing air intake, ensuring a peaceful and comfortable environment in your home. | ENHANCE HOME AESTHETICS - Embodying a powder-coated finish, the ac return grille exhibits resilience against flaking, scratching, and fading, granting your home or office space a contemporary appearance while maintaining a refreshing atmosphere. | EASY INSTALLATION - Installing this metal return vent cover is a breeze, with simple, hassle-free mounting options and included screws. Enjoy a quick and straightforward setup to enhance your home's ventilation.