Williams' floor furnaces use no above-the-floor room space as it unobtrusively circulates warm air a€¦ and does it without the aid of a blower. Fitted with an automatic floor register grille temperature control and nonelectric pilot to ensure continuous heat -- even during power outages. Includes a wall-mounted thermostat and automatic temperature and safety controls. The furnace is vented vertically to the outside (venting material not included).