This is the minimum level of ventilation (sourced from outside air) required by occupants.
Fresh air requirement is a function of occupancy and is typically calculated on the basis of 8 l/s/person. It applies all year round during the occupancy hours.
In the ‘real building’ (the model for non-compliance simulations, as presented in the Apache module and in the Room Template) the fresh air requirement should be set using either ‘System outside air supply’ (Room Data ‘System’ tab) or ‘Auxiliary ventilation’ (Room Data ‘Air Exchange’ tab).
Fresh air requirement applies to all types of conditioning (A/C, mech vent and nat vent). In the case of natural ventilation the implication is that it is achieved by window opening or trickle vents. Using MacroFlo for this is not recommended because of the complications this gives rise to in VE Compliance.
For Part L2 (2021), all user-specified settings for ‘System outside air supply’ and ‘Auxiliary ventilation’ are turned off and replaced by standard values and schedules appropriate to the relevant NCM activities and associated occupancy levels. Note that occupancy levels will in general be different in the ‘real’ and actual buildings, so the fresh air requirements will also be different.
