Reznor® Series 100, Model F gas-fired, gravity-vented unit heaters are designed for 80% thermal efficiency. Model F unit heaters are designed for ceiling suspension with a propeller fan for air delivery. Standard features include a manual match-lit pilot with 100% shutoff and a single-stage, 24-volt gas valve. A terminal strip connector facilitates field connection to a remote 24-volt thermostat for automatic operation. Each unit is provided with a fan control and all required limit safety controls, including an energy cutoff (ECO) device and a blocked vent switch. Aluminized steel heat exchanger. Aluminized steel burner rack with stainless steel insert. 115/1/60 supply voltage. 115 volt fan motor with internal overload protection. Fan and limit safety controls. Energy cutoff (ECO) device. Blocked vent shutoff system. 24-volt control voltage transformer. Individually adjustable horizontal louvers. Full safety fan guard. Terminal strip connector for 24-volt field wiring. Convenient bottom burner access. 2-point 3/8"-16 threaded hanger connections. Horizontal/vertical vent outlet.