Interesting. The pilot keeps heat on a small generator that keeps the gas line open. If the pilot light goes out, this has a spring loaded and positive throw that closes the gas line source. So if you lose a pilot on any gas appliance, dryer, fireplace ow water heater, the gas line is forced closed. So why would I need a vent? The ones that are a concern are the ones that use an electronic ignition like a grill.
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