How do pressure switches enhance user safety in a pellet stove?

Pressure switches enhance user safety in a pellet stove primarily by preventing potential injuries from moving parts. These switches monitor the pressure within the stove system; if they detect an abnormal condition, they can deactivate certain components, such as the combustion fan or the auger motor. This action ensures that if the stove is operating under unsafe conditions, it will limit or stop the operation of parts that could lead to hazardous situations, thereby protecting users from injuries related to moving or malfunctioning components.

The other options do not directly relate to the specific function of pressure switches in maintaining safety. While increasing airflow or shutting off power may contribute to the overall safety of a pellet stove, those functions are not directly managed by pressure switches. Monitoring humidity levels is also not relevant to their operation, as pressure switches focus on system pressure rather than environmental conditions.