Dayton rectangular fire dampers are fire protection frames employed in ventilation, heating and air conditioning ducts to stop the spread of fire inside the ductwork. They are engineered for use in penetrations of fire-rated barriers or duct systems that are manufactured to have pressurized airflow when the dampers are required to be closed during fires. Choose from a wide range of these fire dampers, available in variants having free area ranging from 0.219 to 1.416 sq. ft. on Raptor Supplies