- Notes:
- Values for target air ratio given in this table are for the air ratio measured at the furnace exhaust outlet at combustion at near rated load after inspection or repair.
- The value for liquid fuel shall be used for the air ratio of industrial furnaces combusting blast furnace gas or other byproduct gas.
- Values for target air ratio given in the table shall not apply to the air ratios of the following industrial furnaces; provided, however, that consideration shall be given to control of air ratio based on the table where possible.
- (1) Furnaces with a rated capacity (burner fuel combustion performance) of under 20 L per hour (fuel equivalent).
- (2) Furnaces requiring a special atmosphere for oxidation or reduction.
- (3) Furnaces requiring dilution air for heat pattern maintenance or equalization of internal temperature.
- (4) Furnaces combusting byproduct gas with a heat value of not more than 3,800 kJ per normal cubic meter.
- (5) Furnaces not in operation at regular inspection or otherwise not in regular use, and furnaces used for development, research, or trial production.
- (6) Industrial furnaces using materials that degenerate at high temperature and requiring air for cooling dilution.
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