Physical disturbances to boiler furnace pressure within which a combus
tion process is taking place can cause undesirable effects including n
uisance outages, sooting, and poor fuel efficiencies. Draft controls c
an stabilize these disturbances and provide a more constant furnace pr
essure. This paper discusses draft, draft control, and their effect on
the combustion process in typical commercial and industrial watertube
or firetube boilers. (C) 1997 Elsevier Science Ltd.