Which situation does NOT require licensing under the chapter provisions?

The correct answer highlights that a firm engaged solely in the sale of fire extinguishers does not require licensing under the specified chapter provisions. This is because the focus of licensing is generally on the service and installation aspects of fire extinguishers, which involve potential hazards and the need for specialized knowledge.

Selling fire extinguishers as a retail operation typically does not involve the same level of risk or regulatory concerns as installation and maintenance work. Therefore, businesses that purely sell fire extinguishers without involving themselves in installation or servicing are often exempt from the licensing requirements that apply to those who perform more complex tasks involving safety equipment.

In contrast, contractors who perform installations, fire departments engaged in servicing equipment (even if free), and manufacturers who are directly involved in producing and possibly installing or maintaining equipment are subject to stricter regulations and licensing requirements due to the nature of their work involving public safety and compliance with fire safety standards.