Does the ventilation rate in an induction system vary as the load varies?
No. The induction system is a constant volume system, maintaining the same mix proportions of outdoor air and return air. No matter how the load varies with the seasons, the outdoor air rate remains constant. The outdoor air quantity is at least equal to the ventilation rate required by the building regulations. The primary air can be all outdoor air if inter-connected variable dampers are fitted to the return and outdoor air intakes at the primary air AHU, with the upper limit for the outdoor air component being the full primary air flow.
