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The classification of good-fair-poor availability of ventilation is not a real technical
measure. Therefore, when a ventilation system is installed it is advisable to verify that
around the area of emission a good availability of air is present. For this purpose
smoke generators are excellent tools to verify that although a high ventilation is
installed, it actually also removes the smoke from the emission source. However, it
must also be borne in mind that smoke is neutrally or positive buoyant, whereas the
blowing agents under consideration are negatively buoyant. Therefore there are
special smoke generators e.g. from Dräger that simulate this behaviour.
3.3 Classification of zone
The zones are classified by using three parameters:
• Source level
• Ventilation level (HV – MV – LV)
• Ventilation availability
The extension of the zone is defined by:
• The volume of the department in which the ES is positioned
• The presence and the type of openings to the other departments
The ES always generates an area connected to the level of emission:
• Continuous = Zone 0
• Primary = Zone 1
• Secondary = Zone 2
When the level of ventilation is high and with good availability, the zones are of
neglible extent (NE).
The zones are named:
• Zone 0 NE
• Zone 1 NE
• Zone 2 NE
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