Corridor doors in the work area shall not be constructed of hollow core wood and shall not contain louvers. All dwelling unit or sleeping unit corridor doors in work areas in buildings of Groups R-1, R-2, and I-1 shall be at least 13/8-inch (35 mm) solid core wood or approved equivalent and shall not have any glass panels, other than approved wired glass or other approved glazing material in metal frames. All dwelling unit or sleeping unit corridor doors in work areas in buildings of Groups R-1, R-2, and I-1 shall be equipped with approved door closers. All replacement doors shall be 13/4-inch (45 mm) solid bonded wood core or approved equivalent, unless the existing frame will accommodate only a 13/8-inch (35 mm) door.
- Corridor doors within a dwelling unit or sleeping unit.
- Existing doors meeting the requirements of Guidelines on Fire Ratings of Archaic Materials and Assemblies (Appendix C) for a rating of 15 minutes or more shall be accepted as meeting the provisions of this requirement.
- Existing doors in buildings protected throughout with an approved automatic sprinkler system shall be required only to resist smoke, be reasonably tight fitting, and shall not contain louvers.
- In group homes with a maximum of 15 occupants and that are protected with an approved automatic detection system, closing devices may be omitted.
- Door assemblies having a fire protection rating of at least 20 minutes.