5.4.1.2.(3)

Intent 1:

Where required life safety systems are incorporated in environmental separators, to limit the probability of the inadequate control of:

• total heat loss or gain due to air mass transfer,
• airborne vapour transfer from the interior above ground and from the exterior below ground, or
• precipitation ingress due to air pressure differences.

This is to limit the probability of compromised operation of temperature-sensitive or moisture-sensitive life safety systems, which could lead to harm to persons.