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NFPA 90B provides requirements that cover the construction, installation, operation, and maintenance of systems for warm air heating and air conditioning, including filters, ducts, and related equipment to protect life and property from fire, smoke, and gases resulting from fire or from conditions having manifestations similar to fire.
This standard applies to all systems for the movement of environmental air in structures that serve the following: (1) One- or two-family dwellings (2) Spaces not exceeding 708 m3 (25,000 ft3) in volume in any occupancy (3) Buildings of combustible construction over three stories in height shall be in accordance with NFPA 90A. Specific topics include system components, fire integrity of building construction, equipment, wiring, and controls.
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