| 摘要 |
The present invention has an inner and outer hull spaced apart, so that burner intake air may flow between the inner and outer hull. The inner hull has the burner mounted in the bottom in a known manner with an air intake port placed below the burner. A burner ring is mounted above the burner to control the air drafts around the burner. On the inner hull one or more barometric draft valves are placed above the burner. As the air pressure rises, due to increasing wind speed, gas pressure, etc., the barometric valve opens automatically, providing more air to feed the flame and reducing the draft under the burner, thereby preventing the flame from being blown out. In extreme locations, more than one barometric draft valve can be provided. The valves can be set to open at different pressures, allowing for an even greater range of operating conditions.
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