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Dryer Vent
I was recently in a home that had experienced a fire in the Clothes Dryer. Lint accumulation can be a serious contributor to the potential for fires in homes. A lint trap can ease the process of collecting and disposing of accumulating lint. A direct route with limited elbows and not using corrugated ducts will also reduce the chance for lint to be caught inside the duct.
Check the external louvres on the discharge point, indications of lint here are an indicator that maintenance has been ignored.
If during your inspection you find corrugated plastic hosing then I would suggest replacement of this component as it will be the weak point in your system should any heat buildup occur.