In buildings in Occupancy Group R-2 not subject to Section 403, a door from a dwelling unit shall open into an intervening public hall. Such public hall shall be constructed as a public corridor in accordance with Section 1018.
Exceptions:
1. No intervening public hall shall be required for any of the following:
1.1. A building that is both three stories or less in height, and contains two or fewer dwelling units per story; or
1.2. A building that complies with Item 4 of Section 1021.2.
2. No intervening public hall shall be required where the doors opening to the apartments are smoke and draft controlled doors complying with UL 1784 without artificial bottom seals, in accordance with Section 715.3 and 715.3.5.3 and the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1. This exception shall not apply to any building that complies with Item 5 of Section 1021.2 where there is more than one apartment per story.
Exceptions:
1. No intervening public hall shall be required for any of the following:
1.1. A building that is both three stories or less in height, and contains two or fewer dwelling units per story; or
1.2. A building that complies with Item 4 of Section 1021.2.
2. No intervening public hall shall be required where the doors opening to the apartments are smoke and draft controlled doors complying with UL 1784 without artificial bottom seals, in accordance with Section 715.3 and 715.3.5.3 and the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1. This exception shall not apply to any building that complies with Item 5 of Section 1021.2 where there is more than one apartment per story.
In high-rise buildings in Occupancy Group R-2, all doors from a dwelling unit shall open into an intervening public hall. Such public hall shall be constructed as a public corridor in accordance with Section 1018. Such public hall shall provide access to at least two exits.
Exception: Where the only dwelling units on a story of a building are the upper stories of multistory (duplex) dwelling units;
1. Any public halls shall be permitted to provide access to only one exit; or
2. No such public hall shall be required where smoke and draft controlled doors complying with UL 1784 without artificial bottom seals, in accordance with Sections 715.4 and 715.4.6.3, are provided. This exception shall not be construed to effect, alter, or change any requirement of this code to provide two means of egress from each apartment on each story.
Exception: Where the only dwelling units on a story of a building are the upper stories of multistory (duplex) dwelling units;
1. Any public halls shall be permitted to provide access to only one exit; or
2. No such public hall shall be required where smoke and draft controlled doors complying with UL 1784 without artificial bottom seals, in accordance with Sections 715.4 and 715.4.6.3, are provided. This exception shall not be construed to effect, alter, or change any requirement of this code to provide two means of egress from each apartment on each story.