One of our LEED certification credits involves indoor air quality. We're currently conducting an air quality flush-out, which means we suck all the air out the the building and replace it with outside air. This flush out takes place after construction, but before occupancy.
Our space is about 4000 square feet, and our engineers have calculated we need to flush 52 million cubic feet of air. So how long does that take? Six days, IF Mother Nature cooperates. We need to stay within certain temperature and humidity ranges.