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Pipe insulation installed in buildings shall conform to the requirements of the energy code, shall be tested in accordance with ASTM E 84 and shall have a maximum flame spread index of 25 and a smoke-developed index not exceeding 450. Insulation installed in an air plenum shall comply with Section 18-28-602.2.1.
Exception: The maximum flame spread index and smoke-developed index shall not apply to one- and two-family dwellings.