The contract is for the inspection, cleaning, and sanitization of HVAC systems. The work includes removing all visible surface contaminants from the interior surfaces of the air distribution system in multi-story residential buildings. This includes cleaning and disinfecting Air Handling Units (AHUs), Fan Coil Units (FCUs), main distribution ducts, branch air ducts, and dedicated exhaust ventilation systems, adhering to National Air Duct Cleaners Association (NADCA) standards.