2. Small atriums
2.1 Definition
Small atria are located in buildings where the highest floor is no higher than 8 m above the atrium level (R + 2 or R + 1 with basement). Their basic cross-section is at least 5 × 5 m.
2.2 Smoke extraction in small atriums
Smoke extraction is carried out :
or naturally through openings installed in the upper part of the atrium and representing a free area equal to 1/100 of the basic cross-section with a minimum of 2 m2 ;
mechanically, with an extracted...
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Small atriums
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