Steel Buildings in Europe

Part 7: Fire Engineering 7 - 63  Determination of the related vertical opening surface a v : a v = A v / A = 132 m² / 5000 m² = 0,026 The values of the related opening surfaces are introduced in Figure A.1 and the value w 0 can be defined. In Figure A.2, the height of the hall is considered. vertical opening area a v horizontal opening area a h Figure A.1 Factor w 0 according to opening areas height of the hall (m) Figure A.2 Factor  w according to height of the hall The heat extraction value of the buildings is: w = w 0  = 1,70  1,0 = 1,70 The equivalent fire duration ( t ä ) is based on the following factors: the fire load density, the heat extraction factor and a factor c which takes into account the