Which is an example of a preventive maintenance activity?

Changing air filters in HVAC systems is a prime example of a preventive maintenance activity. Preventive maintenance refers to regular, scheduled maintenance performed to prevent equipment failures and ensure optimal performance. In this case, regularly changing air filters is essential for maintaining efficient airflow and preventing dust and debris buildup, which can lead to system malfunctions or reduced efficiency. By performing this task regularly, you prolong the lifespan of the HVAC system, improve air quality, and potentially reduce energy costs.

The other options do not fit into the preventive maintenance category as they focus more on operational or personnel considerations rather than on the upkeep of equipment. Conducting employee interviews is related to human resources and staff management, monitoring daily operations pertains to ensuring workflow and productivity, and hiring new staff is a recruitment activity. These do not involve the routine maintenance required to prevent physical equipment failures.