Good afternoon all,

We are working on a project where we have a 100% Outdoor Air system that will operate at 100% (constant volume) under normal operating conditions, however it has a VFD fan for smoke control purposes, so under emergency situations it would operate as a VAV.

So my question is: should the system require an Outdoor Air measuring station for it, since under emergencies it would operate as a VAV? Or with just an airblade switch/current transducer would be enough for the monitoring requirement since its regular operation will be at a constant flow (and the wording in LEED talks about VAV or CAV systems, not type of fan)?

Thank you,