"The following should be used in SBEM v3.5 to define an enclosed or underground car park which has mechanical ventilation and therefore requires either its own EPC or inclusion in an EPC. The activity must be set to “circulation”, the HVAC system must be set to “Zones without HVAC system” and the mechanical supply/extract system or the mechanical exhaust system must be used to enter the required “Ventilation” or “exhaust” via the zone level tabs."