Heat & Glo 4000INC is a decorative gas appliance, designed for installation in a vented fireplace. This device is certified by A.G.A. DESIGN and CGA for both natural gas and propane use. 4000INC is equipped with an electrical safety system. It features a control system that consists of a gas control valve/regulator, standing pilot assembly, thermopile, piezo ignitor, and an ON/OFF rocker switch. The controls are located in the lower compartment behind the lower hinged grille of the fireplace.