Need some advice on timing for this Prereq. Would there be any draw back to doing our ASHRAE calcs now for this credit and then having out TAB contractor come and measure OA and make adjustments to OA (as needed to meet ASHRAE per our calcs). We plan do begin our preformance period for our other IEQ and MR credits in several months. But I assume as long as I make my PP for this credit start now and end in several months (when the other ones end) it would be okay?