The Hart & Cooley 43408 is a return air filter grille designed for HVAC applications. This model features solid steel construction and is suitable for wall openings of fourteen inches by thirty inches. It integrates easily with standard disposable filters that are one inch thick, which are not included.
This grille is designed to effectively conceal the filter while providing efficient airflow. It has fins spaced at one-third inch and angled at twenty degrees for optimal performance. The average face velocity of the grille is three hundred ninety feet per minute, calculated with a filter capacity rating of two CFM per square inch of gross filter area.