3509822 Williams 35,000 BTU Natural Gas Monterey Plus Top Vent Gravity Single Sided Wall Furnace Affordable and energy-efficient, the Monterey Plus™ Home Furnaces are a traditional home comfort system that delivers both quality performance and low operating costs.Design FeaturesHigh-Efficiency Monterey ModelsNo electricity requiredMatchless pilot igniterEasy installationPatented, side-relief opening draft hood design reduces flue gas temperature to minimize normal heat lossNaturalAutomatic temperature and safety controlsRe-settable vent-limit safety switchThermostat Sold Separately - Part #8967