Rigid metal is the correct product for the construction of a clothes dryer vent due to the fact that it has a smooth interior finish that allows lint to easily pass through lowering the accumulation of lint. Rigid metal ducts likewise have a maximum flame-spread index of no which indicates the stiff metal is less likely to burn quickly and spread out flames.

Dryer Vent Cleaning Oak Park Explains Why They Use Rigid Metal Pipe For dryer Vents