Change of Filtration

As I have posted several times, flush out is pretty much a waste of time and money when it comes to improving post occupancy IAQ.  I have provided published studies to that effect on this forum in the past.  As such, the question is somewhat of a moot point.  However, putting in new filters before the air testing, which is also inappropriate for its stated IAQ purpose, is an adult diapers question (Depends).  If the existing filters are loaded with debris containing materials that are saturated with VOCs or SemiVOCs or have absorbed those compounds then they may contribute to the VOCs in the air of the building.  On the other hand, a loaded filter tends to be more efficient at removing particulates which may lower the overall PM10 in the building.  Since filters are not addressed in the text of the credit I would guess that you could do what you want.  It doesn't seem to be required to be reported.  I would probably recommend putting in new filters since the reduction in PM10 by loaded filters would likely be minimal.  In my experience after doing about 15 of these LEED air tests, none have passed the first time due to numerous reasons (Google in "Dale Walsh CIH NFMT 20 reasons" for some info on this) mostly relating to VOCs.  I'd be happy to share my experiences and things to look out for if anyone wishes to contact me privately.