Identify the material and its location
Visible dust at a register can come from the register or nearby surfaces and does not establish the condition of every duct. Renovation debris or substantial accumulation within accessible ductwork presents a different basis for inspection. Identifying the material and its location helps determine whether cleaning is warranted and which sections are involved. This approach avoids treating ordinary dust, pet hair, or a single dirty grille as proof that the entire system needs service.
