HEVACOMP LOAD CALCULATION ROOM DATA ACH AND OCCUPANCY.

Hi 

Please could you be so kind to answer/clarify below. 

I am doing a heat loss calculation and on the changing room data sheet i would like the ACH be 8 (conditioned air). I have defined this under thermal design however i believe the ach here is for infiltration (unconditioned). How do i define the ACH coming from outside.