In the event of a fire emergency, fire, smoke, and gases can quickly spread through heating, ventilation, and air-conditioning (HVAC) systems, elevating the risk of injury and loss. NFPA 90B, Standard for the Installation of Warm Air Heating and Air-Conditioning Systems, provides complete provisions for the construction, installation, operation, and maintenance of HVAC equipment, including filters, ducts, and related components. The standard applies to indoor systems in one- and two-family dwellings and buildings under 25,000 cubic feet.

NFPA 90B criteria covers:

• HVAC systems, components, and air distribution
• Integration of ventilation and air-conditioning system(s) with building construction
• Fire integrity of building construction
• Controls including wiring, manual control, smoke dampers, and smoke detection for automatic control
• Acceptance testing

The 2024 edition includes:

• Alignment of Chapter 4, Noncombustible Materials, with the extracted text
• UL586 High-Efficiency, Particulate, Air Filter Units, has been added to Chapter 7 to provide additional reference requirements
• Editorial and reference updates to keep the standard current while ensuring ease of use for the reader.