During which phase does the combustion blower continue to operate after fuel is shut off?

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The combustion blower continues to operate during the postpurging phase after the fuel is shut off. This phase is critical for safety and efficiency, as it helps to clear any residual flammable gases or combustion products from the combustion chamber and associated ductwork. The operation of the blower during this time ensures that any remaining combustion byproducts are safely expelled from the system, reducing the risk of fire or explosion due to leftover gases.

During the startup phase, the blower is typically engaged to facilitate combustion air supply, but it does not operate after fuel is shut off. In the shutdown phase, while the system is venting, the focus is generally on stopping the operation of machinery, and the blower may not be actively purging the system. Emergency venting refers to a situation where the system may be rapidly venting gases to prevent hazardous conditions, and it does not imply a controlled purging process like postpurging does.

Hence, postpurging is the correct phase during which the combustion blower continues to function, ensuring a safe and effective removal of any residual materials from the combustion process.

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