Which components must be inspected by opening and closing them if they are readily accessible?

The requirement to open and close components during an inspection focuses on assessing their functionality and condition. Damper doors are critical elements in heating, ventilation, and air conditioning (HVAC) systems as they control airflow within the system. By opening and closing damper doors, an inspector can verify that they operate properly, ensuring that air can be regulated effectively throughout the space.

In the case of fire doors, although they are essential for safety, the inspection typically focuses on visible signs of damage or improper installation rather than functional testing unless specific operational checks are warranted. Flue pipes and vent covers can also be inspected for issues such as blockages, deterioration, or proper installation, but their operation doesn’t usually require direct interaction like the opening and closing of damper doors.

Thus, the focus on damper doors is significant in determining their integrity and proper function as part of an HVAC system, which is why they must be inspected by opening and closing them if they are readily accessible.