NFPA 90B: Standard for the Installation of Warm Air Heating and Air-Conditioning Systems is the premier safety code governing the design, installation, and operation of HVAC systems in one- and two-family dwellings and small commercial buildings. Published by the National Fire Protection Association (NFPA), this standard focuses on mitigating fire hazards, preventing over-temperature conditions, and ensuring the safe distribution of conditioned air in low-occupancy structures. It serves as an essential compliance guide for residential HVAC contractors, building inspectors, home builders, and candidates preparing for state trade licensing examinations.
 
Key Features
Residential Duct Installation: Comprehensive standards for supply and return ducts, clearances to combustibles, flexible connectors, and smoke-developed/flame-spread index limits.
Over-Temperature & Fire Protection: Precise guidelines for temperature limit controls, clearance requirements around warm-air furnaces, and heat-producing appliances.
Plenum & Air Intake Standards: Strict rules for air supply sources, return air intakes, crawlspace/attic plenums, and filter placement to maintain indoor air quality and fire safety.
System Controls & Interlocks: Provisions for electric wiring, safety control circuits, and automatic furnace shutdown devices to prevent thermal runoff and equipment damage.
 
NFPA 90B is used on Florida's CMC (Certified Mechanical Contractor) and CAC (Class A & B Certified Air Conditioning Contractor) licensing exams. Brand new mint condition, current editions used on the exam at the time of purchase. Pre-Tabbed options available for Quick Navigation.