Furnace Technology
Dampers are located

After the I.D. fan
Near the top of the chimney
Anywhere after the I.D. fan
Before the I.D fan

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Furnace Technology
Which is not accomplished in an underfired furnace?

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

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