// CODE SNIPPET
602.2 Combustibles Within Ducts or Plenums
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Materials
exposed within ducts or plenums shall be noncombustible
or shall have a flame spread index not to exceed 25 and a
smoke-developed index not to exceed 50, where tested as a
composite product in accordance with ASTM E84 or UL 723.
Exceptions:
- Return-air and outside-air ducts, plenums, or concealed spaces that serve a dwelling unit.
- Air filters in accordance with the requirements of Section 311.2.
- Water evaporation media in an evaporative cooler.
- Charcoal filters where protected with an approved fire suppression system.
- Products listed and labeled for installation within plenums in accordance with Section 602.2.1 through Section 602.2.3.
- Smoke detectors.
- Duct insulation, coverings, and linings and other supplementary materials installed in accordance with Section 604.0.
- Materials in a hazardous fabrication area including the areas above and below the fabrication area sharing a common air recirculation path with the fabrication area.
Electrical wiring in plenums shall comply with the California Electrical Code. Electrical
wires and cables and optical fiber cables shall be listed and
labeled for use in plenums and shall have a flame spread distance not exceeding 5 feet (1524 mm), an average optical
density not exceeding 0.15, and a peak optical density
not exceeding 0.5, where tested in accordance with NFPA
262.
Discrete
plumbing, mechanical, and electrical products that are
located in a plenum and have exposed combustible material
shall be listed and labeled in accordance with UL 2043.
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