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// CODE SNIPPET

602.2.1 Materials Exposed Within Plenums

NYC Mechanical Code 2008 > 6 Duct Systems > 602 Plenums > 602.2 Construction > 602.2.1 Materials Exposed Within Plenums
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Except as required by Sections 602.2.1.1 through 602.2.1.5, materials exposed within plenums shall be noncombustible or shall have a flame spread index of not more than 25 and a smoke-developed index of not more than 50 when tested in accordance with ASTM E84.
Exceptions:
  1. Rigid and flexible ducts and connectors shall conform to Section 603.
  2. Duct coverings, linings, tape and connectors shall conform to Sections 603 and 604.
  3. This section shall not apply to materials exposed within plenums in one- and two-family dwellings.
  4. This section shall not apply to smoke detectors.
  5. Combustible materials enclosed in approved gypsum board assemblies or enclosed in materials listed and labeled for such application.

602.2.1.1 Wiring

Combustible electrical or electronic wiring methods and materials, optical fiber cable, and optical fiber raceway exposed within a plenum shall have a peak optical density not greater than 0.50, an average optical density not greater than 0.15, and a flame spread not greater than 5 feet (1524 mm) when tested in accordance with NFPA 262. Only type OFNP (plenum rated nonconductive optical fiber cable) shall be installed in plenum- rated optical fiber raceways. Wiring, cable, and raceways addressed in this section shall be listed and labeled as plenum rated and shall be installed in accordance with New York City Electrical Code.

602.2.1.2 Fire Sprinkler Piping

Plastic fire sprinkler piping exposed within a plenum shall be used only in wet pipe systems and shall have a peak optical density not greater than 0.50, an average optical density not greater than 0.15, and a flame spread of not greater than 5 feet (1524 mm) when tested in accordance with UL 1887. Piping shall be listed and labeled.

602.2.1.3 Pneumatic Tubing

Combustible pneumatic tubing exposed within a plenum shall have a peak optical density not greater than 0.50, an average optical density not greater than 0.15, and a flame spread of not greater than 5 feet (1524 mm) when tested in accordance with UL 1820. Combustible pneumatic tubing shall be listed and labeled.

602.2.1.4 Combustible Electrical Equipment

Combustible electrical equipment exposed within a plenum shall have a peak rate of heat release not greater than 100 kilowatts, a peak optical density not greater than 0.50 and an average optical density not greater than 0.15 when tested in accordance with UL 2043. Combustible electrical equipment shall be listed and labeled.

602.2.1.5 Foam Plastic Insulation

Foam plastic insulation used as wall or ceiling finish in plenums shall exhibit a flame spread index of 75 or less and a smoke developed index of 450 or less when tested in accordance with ASTM E 84 and shall also comply with Section 602.2.1.5.1, 602.2.1.5.2 or 602.2.1.5.3.

602.2.1.5.1 Separation Required

The foam plastic insulation shall be separated from the plenum by a thermal barrier complying with Section 2603.4 of the New York City Building Code.

602.2.1.5.2 Approval

The foam plastic insulation shall be approved based on tests conducted in accordance with Section 2603.8 of the New York City Building Code.

602.2.1.5.3 Covering

The foam plastic insulation shall be covered by corrosion-resistant steel having a base metal thickness of not less than 0.0160 inch (0.4 mm).

Related Code Sections


602.2.1 Duct Systems, Materials Exposed Within Plenums
Except as required by Sections 602.2.1.1 through 602.2.1.5, materials exposed within plenums shall be noncombustible or shall have a flame spread ...
NYC Mechanical Code 2008 > 6 Duct Systems > 602 Plenums > 602.2 Construction > 602.2.1 Materials Exposed Within Plenums
307.6 General Regulations, Piping Materials Exposed Within Plenums
All piping materials exposed within plenums shall comply with the provisions of the New York city mechanical code ...
NYC Plumbing Code 2008 > 3 General Regulations > 307 Structural Safety > 307.6 Piping Materials Exposed Within Plenums
307.6 General Regulations, Piping Materials Exposed Within Plenums
All piping materials exposed within plenums shall comply with the provisions of the New York City Construction Codes ...
NYC Plumbing Code 2014 > 3 General Regulations > 307 Structural Safety > 307.6 Piping Materials Exposed Within Plenums
602.2.1.5.1 Duct Systems, Separation Required
The foam plastic insulation shall be separated from the plenum by a thermal barrier complying with Section 2603.4 of the New York City Building Code ...
NYC Mechanical Code 2008 > 6 Duct Systems > 602 Plenums > 602.2 Construction > 602.2.1 Materials Exposed Within Plenums > 602.2.1.5 Foam Plastic Insulation > 602.2.1.5.1 Separation Required
602.2.1.5.2 Duct Systems, Approval
The foam plastic insulation shall be approved based on tests conducted in accordance with Section 2603.8 of the New York City Building Code ...
NYC Mechanical Code 2008 > 6 Duct Systems > 602 Plenums > 602.2 Construction > 602.2.1 Materials Exposed Within Plenums > 602.2.1.5 Foam Plastic Insulation > 602.2.1.5.2 Approval
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