Fuels and Combustion
The main advantage of forced draft over natural draft is that

Combustion of fuel is complete
Furnace control is easier
All of these
Smaller height chimney can be used

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Fuels and Combustion
Cannel coal

Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
Has a high volatile matter content and burns with a luminous smoky flame
Is non-coking
All of these

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