The State of Maryland hired Duct & Vent Cleaning of America, Inc to contact H.E.P.A vacuum all of the existing ductwork of the Senate chamber, House chamber and associated duct work in the mechanical room. This work also included cleaning of two (2) Air Handler Units (AHU's), registers, grills and diffusers. This job was cleaned to the NADCA visual cleanliness verification which was completed by the customer at the end of each shift.