Why is there no perfect cleaning interval?
A short straight metal run used lightly behaves differently from a long route with several turns serving frequent loads.
Inspect performance and visible conditions rather than assuming every property follows the same timetable.
What dryer-vent signs should you act on?
Long dry times, excess heat, weak exterior airflow, lint at joints, repeated shutoffs, or a damaged connector are practical reasons to inspect the system.
The route should exhaust outdoors and remain intact, reasonably short, and appropriate for dryer use.
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These sources support safety, energy, food-storage, recall, and vent guidance. They do not endorse Appliance King.