We assessed the air handler and connected ducts, opened the blower section for access and documented interior conditions before and after the work shown. Temporary covers closed unused room openings to help contain disturbed dust and concentrate negative suction through the section being cleaned. Later photographs show coated supply openings and the air handler reassembled. The inspection images also record discolored lining and metal oxidation, which are distinct from loose dust. This sequence documents assessment, component access, source-removal work and local restoration without claiming every system condition was corrected.