In a boiler installation the natural draught is produced

Question

Options:

A . due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in

B . due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column

C . due to the fact that at the chimney top the pressure is more than its environmental pressure

D . all of the above

Answer: Option B

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