Dryer ducts are metal
Unlike the HVAC ducts which are flexiable tubing that can be torn during cleaning the dryer duct is a metal pipe going out through your roof. Typically the dryer vent cap is removed on the roof, inspected and cleared of lint/dirt. The dryer vent pipe is cleaned with a brush on a cable that is moved up and down the pipe. That lint can restrict the air flow and in some cases catch on fire. Dryer vent cleaning should be done periodically. How often? We do ours every 18 months because past experience has shown this is when the lint has built enough to need cleaning. The cleaning frequency depends on your specific situation (the number of dryer cycles and how effective the dryer screen is in catching the lint).
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