furnaces:
- Furnaces using solid fuel, excluding single-fuel furnaces fueled by powdered coal.
- Furnaces with a rated capacity (burner fuel combustion performance) of under 20 L per hour (fuel equivalent).
- Furnaces requiring a special atmosphere for oxidation or reduction.
- Furnaces requiring dilution air for heat pattern maintenance or equalization of internal temperature.
- Furnaces combusting byproduct gas with a heat value of not more than 3,800 kJ per normal cubic meter.
- Furnaces not in operation at regular inspection or otherwise not in regular use, and furnaces used for development, research, or trial production.
- Industrial furnaces using materials that degenerate at high temperature and requiring air for cooling dilution.
- Furnaces combusting combustible waste.
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