I have a client who is asking about air testing for an office building renovation project where small parts of each floor will be renovated. The building has 8 floors with north and south sections. When calculating the number of tests, do we test in the areas renovated only or do we test the same way we would if the whole floor were renovated if it's all one zone? So if only 2,000 square feet were renovated do we have to test the whole floor even if it is 40,000 square feet and possibly could mean 2 tests per floor? I think this project may be better served by a flush out. Does anyone have any advice?