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18-28-602.2.1  Materials exposed within plenums.
   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 E 84. No floor drains or sanitary waste and vent piping, storm drain piping or condensate drain piping may be exposed within a supply plenum. No material which has the potential of contaminating the air stream may be located in a supply plenum.
   Exceptions:
      1.   Rigid and flexible ducts and connectors shall conform to Section 18-28-603.
      2.   Duct coverings, linings, tape and connectors shall conform to Sections 18-28-603 and 18-28-604.
      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.