The Vevor return air filter grille is designed for a 30 x 20-inch duct opening and helps improve ventilation performance in residential or commercial HVAC systems. Its angled blade design promotes efficient airflow while reducing noise during operation. Made from powder-coated steel, it offers durable, rust-resistant construction for long-term use. The detachable face and flip-open design make cleaning and filter replacement easier. It is compatible with standard 1-inch filters, though the filter is not included.