What is NFPA 90A and how does it relate to HVAC controls?

• A. A standard for the installation of air conditioning and ventilation systems; influences safe design and control interlocks.
• B. Fire extinguisher placement in rooms.
• C. Electrical wiring standards.
• D. Pest control guidelines.

Answer: (A)

NFPA 90A covers the installation of air conditioning and ventilating systems. It provides the safety-focused rules for how HVAC equipment and their control systems should be installed and wired, including how controls and interlocks are arranged to prevent unsafe operation and to coordinate with fire safety measures. This means the standard influences how dampers, fans, shutoffs, and other control devices are integrated so the system can safely start, stop, or isolate parts of the building during normal operation and emergencies.

It’s not about fire extinguishers (that’s NFPA 10), electrical wiring standards (NFPA 70), or pest control guidelines, so those options don’t fit.