BOILERS, FUELS AND FLUES 225 



The following table shows the size and 

 height of chimneys required by steam boil- 

 ers. For hot-water boilers multiply the radi- 

 ating surface by 1.5. 



Height of chimney in feet 



Sq.ft. 20 30 40 50 60 80 100 120 

 st'm rad. Size of Chimney (dia. or 1 side sq.) in inches 



