Linda, Morgan,
THANK YOU!!!
Yes, I always try as much as possible to answer my own questions but I was stuck. I couldn't seem to find the right area in the documentation. I even searched this yahoo group using the search engine.
So, I read those areas that you suggested. They gave nice clear directions for when to say 'yes' or 'no' for sizing. My lingering question is ... what about if it's already existing? (I also searched all documents for 'existing building' and 'retrofit'.)