NFPA 37

NFPA 37 is the The National Fire Protection Association’s standard for the installation and use of stationary combustion engines. Its requirements limit the spacing of an engine generator to a minimum of 5 ft (1.5 m) from an opening in a structure or a structure having combustible walls, and require the engine generator to be located where it is readily accessible for maintenance, repair, and first responders. The standard contains an exception which allows an engine generator to be closer to a combustible wall when approved testing demonstrates a fire originating at the engine does not ignite the combustible structure. Please refer to your unit’s installation manual for details of reduced minimum distances allowed as a result of such testing.