Before photos show heavy layered dust in the return branch and return base, thick buildup on two bathroom exhaust-fan assemblies, and lint restricting the lower portion of the exterior dryer outlet. Hygienic Air connected vacuum hoses to maintain negative suction while branch lines and the return system were mechanically agitated, helping draw loosened material toward outside collection. Accessible air-handler components were serviced, the bath-fan assemblies were cleaned, and lint was removed from the dryer termination. Later photographs show substantially less loose material in the return system, cleaner fan components, and a clearer exterior outlet while persistent staining and overspray remain documented.