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Yeah there are 4 or 5 grades of coal that are commonly burned.
Peat, but you really don't want to burn peat.
Lignite, or brown coal.
Sub and regular Bituminous coal
Steam coal
Anthracite
Graphite
Steam coal and anthracite usually are one grade these days and most people don't burn graphite.
I want steam coal, anthracite or high grade bituminous coal for my coal furnace.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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