Induced-draft (ID) fans are a critical component of a fired furnace air-preheat system (Fig. 1). They are necessary in the control of furnace box pressure. An increase in furnace firing rate, changes in flue gas pressure drop, unresolved air leaks and general degradation of the ID fan internals are all reasons to consider a revamp.
Fig. 1
Typical fired furnace air preheat system.
Fig. 2 shows a typical centrifugal fan. ID fan performance can be restored or increased with
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