Parallel fan-powered terminals are typically used for heating and cooling of perimeter zones. In the parallel fan-powered terminal, the fan section is outside of the primary airstream and typically only runs in the heating mode. It is typically sized for 50% of the maximum primary airflow, which can result in lower noise levels, lower unit first costs, and reduced energy consumption when compared to a series fan power terminal. Conditioned primary air volume is varied during cooling while the fan cycles on during heating.