| EXCEPTIONS: | 1. A fire-resistance rating is not required for corridors in an occupancy in Group E where each room that is used for instruction has at least one door directly to the exterior and rooms for assembly purposes have at least one-half of the required means of egress doors opening directly to the exterior. Exterior doors specified in this exception are required to be at ground level. |
| 2. A fire-resistance rating is not required for corridors contained within a dwelling or sleeping unit in an occupancy in Group R. | |
| 3. A fire-resistance rating is not required for corridors in open parking garages. | |
| 4. A fire-resistance rating is not required for corridors in an occupancy in Group B which is a space requiring only a single means of egress complying with Section 1015.1. | |
| 5. In Group R-2 boarding homes and residential treatment facilities licensed by Washington state, rest areas constructed as required for corridors shall be allowed to be open to the corridor provided: | |
| 5.1 The area does not exceed 150 square feet, excluding the corridor width; | |
| 5.2 The floor is separated into at least two compartments complying with Section 407.4; | |
| 5.3 Combustible furnishings located within the rest area shall be in accordance with the International Fire Code section 805; | |
| 5.4 Emergency means of egress lighting is provided as required by Section 1006 to illuminate the area. |
| EXCEPTIONS: | 1. Use of a corridor as a source of makeup air for exhaust systems in rooms that open directly onto such corridors, including toilet rooms, bathrooms, dressing rooms, smoking lounges and janitor closets, shall be permitted provided that each such corridor is directly supplied with outdoor air at a rate greater than the rate of makeup air taken from the corridor. |
| 2. Where located within a dwelling unit, the use of corridors for conveying return air shall not be prohibited. | |
| 3. Where located within tenant spaces of one thousand square feet (93 m2) or less in area, utilization of corridors for conveying return air is permitted. | |
| 4. Where such air is part of an engineered smoke control system. | |
| 5. Make up or relief air in corridors of Group 1-2 Occupancies. | |
| 6. Corridors serving residential occupancies shall be permitted to be supplied without specific mechanical exhaust subject to the following: | |
| 6.1 The supply air is one hundred percent outside air; and | |
| 6.2 The units served by the corridor have conforming ventilation independent of the air supplied to the corridor; and | |
| 6.3 For other than high-rise buildings, the supply fan will automatically shut off upon activation of corridor smoke detectors which shall be spaced at no more than thirty feet (9,144 mm) on center along the corridor; or | |
| 6.4 For high-rise buildings, corridor smoke detector activation will close required smoke/fire dampers at the supply inlet to the corridor at the floor receiving the alarm. |