Furnace Technology
Air filtration in a furnace

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

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Furnace Technology
In a furnace employing forced draught as compared to induced draught,

Positive pressure exists in the furnace
Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
None of these
The fan operates hot and hence blades are liable to corrosion and erosion

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