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// CODE SNIPPET

602.2 Combustibles Within Ducts or Plenums

California Mechanical Code 2019 > 6 Duct Systems > 602.0 Material > 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:
  1. Return-air and outside-air ducts, plenums, or concealed spaces that serve a dwelling unit.
  2. Air filters in accordance with the requirements of Section 311.2.
  3. Water evaporation media in an evaporative cooler.
  4. Charcoal filters where protected with an approved fire suppression system.
  5. Products listed and labeled for installation within plenums in accordance with Section 602.2.1 through Section 602.2.3.
  6. Smoke detectors.
  7. Duct insulation, coverings, and linings and other supplementary materials installed in accordance with Section 604.0.
  8. 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.

602.2.1 Electrical

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.

602.2.2 Fire Sprinkler Piping

Nonmetallic fire sprinkler piping in plenums 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 UL 1887.

602.2.3 Pneumatic Tubing

Nonmetallic pneumatic tubing in plenums 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 UL 1820.

602.2.4 Discrete Products in Plenums

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.

Related Code Sections


602.2 Duct Systems, Combustibles Within Ducts or Plenums
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 ...
California Mechanical Code 2019 > 6 Duct Systems > 602.0 Material > 602.2 Combustibles Within Ducts or Plenums
602.2 Duct Systems, Combustibles Within Ducts or Plenums
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 ...
California Mechanical Code 2016 > 6 Duct Systems > 602.0 Material > 602.2 Combustibles Within Ducts or Plenums
602.2.2 Duct Systems, Fire Sprinkler Piping
Nonmetallic fire sprinkler piping in plenums shall be listed and labeled for use in plenums and shall have a flame spread distance not exceeding 5 ...
California Mechanical Code 2019 > 6 Duct Systems > 602.0 Material > 602.2 Combustibles Within Ducts or Plenums > 602.2.2 Fire Sprinkler Piping
602.2.4 Duct Systems, Loudspeakers and Recessed Lighting
Loudspeakers and recessed lighting fixtures, including their assemblies and accessories, in plenums shall be listed and labeled for use in plenums ...
California Mechanical Code 2016 > 6 Duct Systems > 602.0 Material > 602.2 Combustibles Within Ducts or Plenums > 602.2.4 Loudspeakers and Recessed Lighting
602.2.1 Duct Systems, Electrical
Electrical wiring in plenums shall comply with NFPA 70. Electrical wires and cables and optical fiber cables shall be listed and labeled for use ...
California Mechanical Code 2016 > 6 Duct Systems > 602.0 Material > 602.2 Combustibles Within Ducts or Plenums > 602.2.1 Electrical
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