With time, all dryer vents will collect lint which is highly flammable. All it takes is a spark from inside the dryer to spark it and trigger a quickly spreading fire. On a regular basis, a clothes dryer fire triggers extreme damage prior to it is observed as it starts in the vent, inside a wall or often, causing the roofing system.
Spicewood Dryer Vent Cleaning Wizard Expert in All Aspects of Dryer Vent Cleaning