Specifications include, but are not limited to: Prior to the cleaning and remediation, an evaluation shall be performed on the building and air conditioning system. The air conditioning system shall be inspected for potential contaminates in the alr stream of the building. Contractor shall thoroughly inspect and clean the inside of all Air Handling Units, all Variable Air Volume devices (VAV boxes), mixing boxes, all supply air ductwork, return air ductwork and outside air ductwork. It shall be Contractor's responsibility to ensure that the ductwork and the inside of air handling units are not damaged nor have defects. ;All surface areas, work stations, desks, chairs, counters, and walking areas shall be covered with plastic sheeting before any ceiling panels are removed ; The air duct cleaning collection equipment shall be high-powered negative air vacuum systems with the final filtration stage HEPA filters. The ductwork shall be cleaned one section at a time. A critical barrier shall be constructed in the ductwork to isolate a section of ductwork to be cleaned. A ten (10) inch diameter vacuum hose shall be attached to the ductwork from the negative air vacuum unit to create a negative pressure in the ductwork relative to the occupied areas of the building. A mechanical, rotating brush shall be moved through the ductwork to dislodge dirt and debris from the top, sides and lower surfaces of the ductwork.