Establish what material is present and where
Inspection should identify the material, its location, and whether it is in supply ducts, return ducts, or an accessible part of the air handler. If renovation work occurred, observations can help determine whether debris entered particular sections. A dirty register alone does not establish the condition of the full duct system. The scope should be based on accessible findings rather than assuming that every duct requires cleaning or that cleaning will resolve unrelated indoor-dust concerns.
