In a boiler installation the natural draught is produced_____________?

Question

Xaibi Aslam · Accepted Answer

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

Xaibi Aslam · Answer

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

Xaibi Aslam · Answer

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

Xaibi Aslam · Answer

all of the above

Question #76264