Dryer Vent Cleaning vs. Replacement: Making the Right Call

When Cleaning Is Sufficient

For the majority of dryer vent service appointments, professional cleaning is all that's needed. If your duct is rigid metal in good condition, properly installed, within the recommended run length, and the blockage is lint accumulation rather than structural damage — cleaning restores full function completely.

A clean duct with no structural issues can perform for the life of the home without replacement. Annual cleaning maintains it in good condition indefinitely.

When Replacement Is Necessary

Certain conditions require duct replacement regardless of cleaning. Plastic accordion duct — the thin, flexible type often installed in the 1980s and 1990s — should be replaced with rigid metal duct. Plastic duct is a fire code violation in many jurisdictions, cannot be adequately cleaned due to its ridged interior surface, and can melt or collapse.

Crushed or permanently kinked duct sections cannot be restored by cleaning — the damaged section must be replaced. Duct that has disconnected inside a wall and is venting into a wall cavity rather than to the exterior must be repaired or replaced.

Ducts with holes, gaps at connection points, or missing sections must be repaired.

Exterior Cap Replacement

Exterior vent caps have a shorter lifespan than the duct itself. Plastic caps become brittle and break over time. Damaged damper mechanisms fail to open or close properly. Caps with screens accumulate lint inside the screen mesh and become restricted.

Caps with damaged flaps, broken housing, or persistent blockage from screens should be replaced rather than cleaned repeatedly. The cost of cap replacement is modest and the improvement in airflow can be significant.

The Professional Recommendation

A professional dryer vent cleaning inspection tells you exactly what condition your duct and cap are in, and whether cleaning or replacement is the right course. Trust the technician's assessment — and get a clear explanation of why replacement is recommended if that's the finding.