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The minimum fire resistance rating for the enclosure of floor openings shall be as follows (see 7.1.3.2.1 for enclosure of exits):
  1. Enclosures connecting four or more stories in new construction — 2-hour fire barriers
  2. Other enclosures in new construction — 1-hour fire barriers
  3. Existing enclosures in existing buildings1/2-hour fire barriers
  4. Enclosures for lodging and rooming houses — as specified in Chapter 26
  5. Enclosures for new hotels — as specified in Chapter 28
  6. Enclosures for new apartment buildings — as specified in Chapter 30

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