What is the inspection frequency required for portable heating devices at construction sites?

The correct answer is that portable heating devices at construction sites must be inspected once every four hours. This frequency is established to ensure safety and compliance with regulations concerning the use of heating equipment in potentially hazardous environments. Regular inspections help identify any potential malfunctions or unsafe conditions that could lead to fires or other safety hazards associated with these devices.

By conducting inspections every four hours, personnel can maintain a vigilant approach to safety, which is critical in construction settings where flammable materials are often present. This interval strikes a balance between ensuring safety without being overly burdensome on workers, allowing them to effectively perform their duties while maintaining a safe environment.