https://rtlt.preptoolkit.fema.gov/Public/Resource/ViewFile/4-508-1117?type=Pdf&q=engine
fema goes ty 1 to ty 5
seem similar to the widland standards but are a bit different
fema is from 2005 ... unknown if still used
I wonder if nfpa also has different typing standards
keywords ... type 1 engine type 2 engine type 3 engine type 4
engine ... engine definitions ... engine classes ... engine types
... types of engines ... official typing scheme
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