NFPA 90A governs which aspect of building systems?

• A. Electrical wiring insulation
• B. Duct detection in HVAC systems
• C. Fire alarm paper documentation
• D. Water-based sprinkler design

Answer: (B)

NFPA 90A covers how air-conditioning and ventilating systems are designed, installed, and maintained in buildings. That naturally includes the ductwork and the components that move and condition air, along with safety features that pertain to those systems. So, when the question mentions duct detection in HVAC systems, it aligns with the scope of NFPA 90A, which governs the proper installation and integration of HVAC ducts and related hardware.

The other options point to areas outside NFPA 90A’s focus: electrical wiring insulation falls under electrical codes like the NEC; fire alarm documentation is addressed by fire alarm standards such as NFPA 72/101; and water-based sprinkler design is governed by NFPA 13.