Furnace Technology
Air filtration in a furnace

Increases the flue gas temperature
None of these
Reduces its thermal efficiency
Is indicated by flame sting out

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Furnace Technology
Which is not accomplished in an underfired furnace?

Reduction in the temperature of furnace gases
Portection of the periphery of the charge from excessive radiation
Increase in heating capacity/m² of floor space
Elimination of cold spot at the bottom of the charge

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