99. A steam generator with economizer and air heater has an overall draft loss of 25.78 cm of

water. If the stack gases are at 177°C and if the atmosphere is at 101.3 kPa and 26°C, what

theoretical height of stack in meters is needed when no draft fan is used? Assume that the gas

constant for the flue gases is the same as that for air.

A. 611.10 B. 631.10 C. 651.10 D. 671.10