4. Smoke extraction (Article V 6)
§ 1 In mitigation of article DF 7 (§ 7 of [TBA 3 004]), only the following must be cleared of smoke:
basement rooms with a surface area of over 300 m2;
rooms with a surface area of more than 300 m2 on the first floor or upper floor, and with a ceiling height of less than 4 m.
The establishments referred to in this article are class 1 for the purposes of determining the coefficient as defined in the appendix to Technical Instruction no. 246
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Smoke extraction (Article V 6)