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There is visible debris, an odor, moisture, pests, or a concern that needs to be checked rather than assumed.

A cleaning scope has been proposed but the accessible system and materials have not been documented.

Someone has reported mold, debris, or another condition without showing where it is.

A quote names only one duct section although the concern may involve more of the forced-air system.

Work is complete but the homeowner has not seen how cleanliness was verified.

The system cannot be inspected or cleaned through existing openings alone.

The system may use bare sheet metal, flex duct, duct board, or internally lined duct, each needing different care.

The assessment documents substantial debris, pests, or visible contamination across more than one system component.

Excessive debris is documented in supply-side ductwork or is being released from supply registers.

Excessive debris is documented in return-side ductwork beyond normal dust on a return grille.

Supply-register surfaces are visibly dirty or debris is documented at the outlet.

A return grille has visible dust and the assessment identifies cleaning it as part of the agreed work.

A diffuser is visibly soiled or included in a documented whole-system scope.

The assessment documents debris in the accessible air-handling-unit housing.

A cooling coil is documented as dirty during HVAC service or a condition-led assessment.

A qualified HVAC assessment identifies a heat-exchanger cleaning need within its proper safety scope.

Standing water or debris is documented in a cooling-system condensate pan.

Debris is documented around the accessible fan motor or housing during a complete system assessment.

A filter is missing, clogged, or air can bypass gaps around the holder.

An access hole or door used for inspection or cleaning needs to be left sealed and insulated.

There is substantial visible growth inside hard-surface ducts or on HVAC components.

Fiberglass duct board or liner is wet or visibly moldy.

Ducts are infested with pests or clogged with excessive dust and debris.

Construction or renovation dust entered registers or the HVAC system was run during dusty work.

A provider proposes a biocide, ozone, or sealant inside ductwork.