The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in metres, and T1 = Absolute temperature of air outside the chimney in K)

A. T1 /88.25H

B. 88.25H/T1

C. T1 /176.5H

D. 176.5H/T1

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