| 摘要 |
<p>A venting system is provided for use in venting the combustion chamber of a gas-fired heating plant, or a warn-air furnace or a boiler, having a base, an upper portion and having a flue outlet for combustion gases to be conveyed to a chimney flue provided in the upper portion. The venting system includes a first piping connected to the flue outlet, a second piping connected to the chimney flue, and a diverter box connected to and intercommunicating both of the pipings and having an open bottom disposed well above the base of the furnace at the upper portion thereof and being in constant free communication with the atmospheric air surrounding the furnace which air enters the bottom of the diverter box as cold air. This structure establishes a cold air pressure head below the first piping and establishes a heat lock, substantially to prevent the flow of heated air from the furnace outlet and also substantially to prevent down drafts from the flue from reaching the combustion chamber of the furnace.</p> |
