Furnace pressure is normally controlled by regulating the__________________?
Correct answer: D. Damper
- A. Air pressure
- B. Fuel gas pressure
- C. Speed of I.D. fan
- D. Damper
Explanation
Furnace pressure is commonly adjusted with the flue-gas damper, which changes the resistance to gas discharge and hence the pressure inside the furnace. Air or fuel pressure changes primarily affect combustion rate rather than directly controlling furnace pressure.
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