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The Flue Pressure Switch is a vital safety device used in boilers and heating systems to monitor flue gas pressure and ensure proper ventilation. This switch detects whether the flue is clear and the fan is operating correctly, preventing dangerous conditions such as backdrafting or incomplete combustion. As an essential component of boiler spare parts, it helps maintain safe and efficient operation by signaling the control board to shut down the system if pressure is abnormal. When replacing a faulty flue pressure switch, it is important to choose a reliable part that matches the original specifications. This switch is commonly used in various heating equipment components and is a standard item for boiler maintenance and repair.