Which standard requires that air distribution systems be equipped with smoke detectors?

The requirement for air distribution systems to be equipped with smoke detectors is outlined in NFPA 90A, which is the standard for the installation of air conditioning and ventilating systems. This standard emphasizes the importance of safety in environments where air distribution systems operate, particularly in preventing the spread of smoke and fire through these systems.

Smoke detectors serve a critical role in ensuring that smoke is detected early, allowing for timely evacuation and emergency response. NFPA 90A mandates that where smoke can travel through an air distribution system, it is vital to have detectors installed to enhance safety measures in buildings.

Other standards listed, such as ANSI 245, ASME B31.3, and UL 1337, address different aspects of mechanical systems and piping but do not specifically set requirements for smoke detectors in air distribution systems. Therefore, NFPA 90A is the appropriate standard that directly relates to the installation of smoke detectors to ensure safety in air handling operations.