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The atmosphere that exists between rooms, spaces, or areas within a building that are not separated by an approved smoke barrier. (SAF-END)

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3.3.27.1 Definitions, Common Atmosphere
The atmosphere that exists between rooms, spaces, or areas within a building that are not separated by an approved smoke barrier. (SAF-END) ...
16.4.3.5 New Day-Care Occupancies,
Where three or more means of egress are required from a single room, the number of means of egress permitted to enter into a common atmosphere shall ...
14.1.4.2 New Educational Occupancies, Special Definitions
A list of special terms used in this chapter follows: Common Atmosphere. See 3.3.27.1. Flexible Plan and Open Plan Educational or Day-Care ...
15.1.4.2 Existing Educational Occupancies, Special Definitions
A list of special terms used in this chapter follows: Common Atmosphere. See 3.3.27.1. Flexible Plan and Open Plan Educational or Day-Care ...
14.3.7.1 New Educational Occupancies,
a common atmosphere, exceeds 30,000 ft2 (2800 m2). The length or width of the building exceeds 300 ft (91 m) ...