Surface condition
Light adhered dust does not automatically justify work. Ask for evidence of excessive deposits, contamination, or actual particle release.
Material reading 20
Questions for cleaning bare sheet-metal ducts
Review surface condition, then connect the observation to its source, system location, and a written scope.
DIRECT ANSWER
Start with the condition, not the sales package
Bare sheet metal is more tolerant of controlled mechanical cleaning than fragile liner, but the method still needs limits. Sharp screws, seams, dampers, turning vanes, flexible connectors, and sealants can be damaged by tools pushed blindly through a run.
EPA describes controlled brushing with contact vacuuming and careful resealing of access openings. Ask how the provider will identify obstructions, collect loosened material, protect joints, and avoid applying an internal coating unless a separate, fully explained decision supports it.
READ THE AIR PATH
What deserves a closer look
Hidden features
Dampers, sensors, acoustic sections, and transitions can catch or be damaged by agitation tools. The system map should note them.
Access closure
Cut openings should receive durable mechanical closures and appropriate sealing, not a casual patch that leaks after the visit.
USE THIS SEQUENCE
Move from observation to a written decision
Confirm bare metal
Make sure the section is not internally lined or coated.
Map obstacles
Note dampers, turns, fasteners, and inaccessible branches.
Pair agitation with collection
Ask how loosened debris stays under control.
Inspect seams and access points
Check that the finished path is intact and airtight.
CALL PATH
Ask about the evidence and the written scope
Sunnyvale Airflow Guide is an independent lead-generation website, not an air duct cleaning company. Calls may connect you with an independent service provider. Service availability, qualifications, pricing, and terms must be confirmed directly with that provider.