NFPA 58, 1998
NOTE 1: Cylinder should be located a minimum of 3 feet away from Crawl Space, foundation vent, window or door opennings.
NOTE 2: If DOT cylinder is filled on site from a bulk truck, the filling connection and vent valve must be at least 10 feet from any exterior source of ignition, openings into direct-vent appliances or mechanical ventilation air intakes.
NOTE 3: Tank should be within 85 feet of Fill Truck for hose to reach.
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