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Re: LP tank near direct vent
NFPA 58 3.2.2.2b"Cylinders alongside of buildings shall be located and installed so that the discharge from the cylinder pressure relief device is at least 3 ft horizontally away from any building opening that is below the level of such discharge. The discharge from cylinder pressure relief devices shall be located not less than 5ft. in any direction away from any exterior source of ignition, openings into direct vent (sealed combustion sysytems) appliances, or mechanical ventilation air intakes."
Frank - I had a recent thread about propane tank clearances, and the above was provided by Bob Harper.
Also this diagram.
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