The Vevor return air filter grille is designed for 20" x 20" duct openings and helps improve ventilation in residential and commercial spaces. Its angled fin design supports efficient airflow while reducing noise during heating and cooling operation. Built from powder-coated steel, it is made to resist rust, scratches, and fading over time. The detachable face door and flip-open design make cleaning and maintenance easier. This version is designed for 1" filters, with the filter sold separately.