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Dryer Vent Cleaning
Each point below names the source it comes from and what that source actually says.
USFA cites failure to clean as the leading contributing factor in home clothes dryer fires in the data it summarizes. That supports the customer-facing safety hook. It does not prove a dense route or owner income by itself.
CSIA describes the Certified Dryer Exhaust Technician credential as dryer-vent-specific and nationally recognized. NADCA credentials are adjacent for HVAC inspection, cleaning, and restoration. Together, those sources support a credibility ladder, while the page keeps government licensing tied to local business rules and repair scope.
The business-guide source gives startup, pricing, and owner-income planning bands, but those are directional. SBA also explains that business licenses and permits vary by activity and location. That is why the page centers route density and lead cost instead of treating the top-end claim as normal.
No clean public owner-income dataset separates dryer-vent-only businesses from chimney, air-duct, HVAC, or appliance-repair bundles. The owner band is directional and depends heavily on route density.
Exact repair, duct-alteration, install, or HVAC boundaries must be checked locally before selling that work. Cleaning alone and system alteration are not the same scope.