Hi, I am starting work on a laboratory building and have been looking at the standards to see how they apply. The project will use both an ASHRAE 90.1 2007 and 2010 baseline building (one of LEED target and the other for separate project target). My questions are:

1) Bypass air to maintain exhaust stack minimum air flow requirements for plume. Can this be classed as process energy as it never goes into the space? I think it is
2) ASHRAE 90.1 2007 says the baseline should reduce exhaust and makeup air volume to 50% of design values during unoccupied periods – If this is not allowed by the AHJ would the requirement to have the full ACH at all times (or as specified by AHJ) in the proposed supersede this statement for the baseline so the rates match.