During the demolition stage it is paramount to maintain air quality.  With a goal of being LEED Certified, we are taking the following precautions into consideration.  As the demo is in progress we have two huge dishwasher sized HEPA air purifiers constantly running.  The HEPA air purifiers remove particulates, VOC’s (Volatile Organic Compounds), and odors.  As carpets and drywall are removed, dust in the air passes through the giant HEPA filters.  Once the air is purified it is released out the back of the unit.  The filters are constantly being monitored and every few hours as the filters change color from blue to grey, they are changed and replaced with new filters.  This ensures that air quality is maintained for the people are that are working as well as the other tenants inside the building.