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Combustibles shall not be permitted in concealed spaces of buildings of Type I or II construction.
  Exceptions:
  1. Combustible materials in accordance with Section 603.
  2. Combustible materials complying with Section 602 of the New York City Mechanical Code.
  3. Class A interior finish materials.
  4. Combustible piping within partitions or enclosed shafts installed in accordance with the provisions of this code. Combustible piping shall be permitted within concealed ceiling spaces where installed in accordance with the New York City Mechanical Code and the New York City Plumbing Code.
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