Patent ID: 6877670

Claim:
A method of installing a boiler ventilation system in a boiler system having a boiler, an economizer, a flue gas exhaust system, and an induced draft fan, the method comprising: determining ventilation fan requirements for the boiler system; selecting a takeoff point in the ductwork of the boiler system that includes boiler system ductwork for exhausting flue gas and an internal isolation damper disposed in the boiler system ductwork; permanently installing a ventilation system ductwork at the takeoff point, the ventilation system ductwork being connected to the flue gas exhaust system intermediate the economizer and the internal isolation damper; installing a ventilation isolation damper in the ventilation system ductwork; and installing a ventilation fan in the ventilation system ductwork, wherein the flue gas exhaust system is utilized during boiler system operations by (a) ensuring the ventilation fan is off, (b) ensuring the ventilation isolation damper is closed, (c) ensuring the internal isolation damper is open, and (d) running the induced draft fan, the ventilation system is utilized during boiler system outages by (a) stopping the induced draft fan, (b) closing the internal isolation damper, (c) opening the ventilation isolation damper, and (d) starting the ventilation fan, and a transition from the utilization of the ventilation system to the flue gas exhaust system at the completion of a boiler system outage before resuming operation of the boiler includes (a) stopping the ventilation fan, (b) closing the ventilation isolation damper, (c) opening the internal damper, and (d) starting the induced draft fan.