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This chapter shall apply to one- and two-family dwellings.
In buildings that are protected by an automatic sprinkler system in accordance with Section 9.7, dwelling units of a residential occupancy shall be permitted to have their sole means of egress pass through a nonresidential occupancy in the same building, provided that all of the following criteria are met:
In buildings that are not protected by an automatic sprinkler system in accordance with Section 9.7, dwelling units of a residential occupancy shall be permitted to have their sole means of egress pass through a nonresidential occupancy in the same building, provided that all of the following criteria are met:
- The sole means of egress from the dwelling unit of the residential occupancy to the exterior shall be separated from the remainder of the building by fire barriers having a minimum 1-hour fire resistance rating.
- The dwelling unit of the residential occupancy shall comply with Chapter 24.
- The sole means of egress from the dwelling unit of the residential occupancy shall not pass through a high hazard contents area, as defined in 22.214.171.124.
Multiple dwelling units of a residential occupancy shall be permitted to be located above a nonresidential occupancy only where one of the following conditions exists:
- Where the dwelling unit of the residential occupancy and exits therefrom are separated from the nonresidential occupancy by construction having a minimum 1-hour fire resistance rating
- Where the nonresidential occupancy is protected throughout by an approved, supervised automatic sprinkler system in accordance with Section 9.7
- Where the nonresidential occupancy is protected by an automatic fire detection system in accordance with Section 9.6
Special terms applicable to this chapter are defined in Chapter 3 of this Code. Where necessary, other terms are defined in the text.
A secondary means of escape shall not be required where one of the following conditions is met:
It shall be an outside window or door operable from the inside without the use of tools, keys, or special effort and shall provide a clear opening of not less than 5.7 ft2 (0.53 m2). The width shall be not less than 20 in. (510 mm), and the height shall be not less than 24 in. (610 mm). The bottom of the opening shall be not more than 44 in. (1120 mm) above the floor. Such means of escape shall be acceptable where one of the following criteria is met:
- The window shall be within 20 ft (6100 mm) of the finished ground level.
- The window shall be directly accessible to fire department rescue apparatus as approved by the authority having jurisdiction.
- The window or door shall open onto an exterior balcony.
- Windows having a sill height below the adjacent finished ground level shall be provided with a window well meeting all of the following criteria:
- The window well shall have horizontal dimensions that allow the window to be fully opened.
- The window well shall have an accessible net clear opening of not less than 9 ft2 (0.82 m2) with a length and width of not less than 36 in. (915 mm).
- A window well with a vertical depth of more than 44 in. (1120 mm) shall be equipped with an approved permanently affixed ladder or with steps meeting both of the following criteria:
- The ladder or steps shall not encroach more than 6 in. (150 mm) into the required dimensions of the window well.
- The ladder or steps shall not be obstructed by the window.
In buildings, other than existing buildings and other than those protected throughout by an approved, supervised automatic sprinkler system in accordance with 24.3.5, every story more than 2000 ft2 (185 m2) in area within the dwelling unit shall be provided with two primary means of escape remotely located from each other.
Any required path of travel in a means of escape from any room to the outside shall not pass through another room or apartment not under the immediate control of the occupant of the first room or through a bathroom or other space subject to locking.
Every bathroom door shall be designed to allow opening from the outside during an emergency when locked.
Floor levels at doors in the primary means of escape shall comply with 126.96.36.199, unless otherwise permitted by any of the following:
- In existing buildings, where the door discharges to the outside or to an exterior balcony or exterior exit access, the floor level outside the door shall be permitted to be one step lower than the inside, but shall not be in excess of 8 in. (205 mm).
- In new buildings, where the door discharges to the outside or to an exterior exit access, an exterior landing with not more than a 7 in. (180 mm) drop below the door threshold and a minimum dimension of 36 in. (915 mm) or the width of the door leaf, whichever is smaller, shall be permitted.
- A door at the top of an interior stair shall be permitted to open directly onto a stair, provided that the door does not swing over the stair and the door serves an area with an occupant load of fewer than 50 persons.
For interior stairways, manual lighting controls shall be reachable and operable without traversing any step of the stair.
Where provided, bulkhead enclosures shall provide direct access to the basement from the exterior.
Stairways serving bulkhead enclosures that are not part of the required primary means of escape, and that provide access from the outside finished ground level to the basement, shall be exempt from the provisions of 188.8.131.52 when the maximum height from the basement finished floor level to the finished ground level adjacent to the stairway does not exceed 8 ft (2440 mm), and the finished ground level opening to the stairway is covered by a bulkhead enclosure with hinged doors or other approved means.
Carbon monoxide alarms or carbon monoxide detectors in accordance with Section 9.12 and 184.108.40.206 shall be provided in new one- and two-family dwellings where either of the following conditions exists:
Where required by 220.127.116.11.1, carbon monoxide alarms or carbon monoxide detectors shall be installed in the following locations:
Carbon monoxide alarms and carbon monoxide detectors as specified in 18.104.22.168.1(1) shall not be required in the following locations:
Where an automatic sprinkler system is installed, either for total or partial building coverage, the system shall be in accordance with Section 9.7; in buildings of four or fewer stories in height above grade plane, systems in accordance with NFPA 13R, Standard for the Installation of Sprinkler Systems in Low-Rise Residential Occupancies, and with NFPA 13D, Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, shall also be permitted.
Heating, ventilating, and air-conditioning equipment shall comply with the provisions of Section 9.2.