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Is there a way of modeling fixed outdoor air fraction for VAV systems in CBECC-Com?

My hunch is that this is only possible through the Exceptional Design Compliance process, but I just wanted to see if there was a way of doing this within CBECC-Com.

I'm looking to model fixed outdoor air fraction for a system that varies supply airflow (the design OA is greater than the minimum required). My assumption is that CBECC-Com defaults to providing the design outdoor air at all times regardless of the supply airflow rate.