“A flexible metal duct should be your second choice ... that’s a clue that there may be a blockage in the dryer vent system.

Like gas ranges, the fuel hookup usually consists of a flexible steel hose ... by removing its duct flap or duct cover. Next you need to buy a specialized dryer vent cleaning kit.

If you have a flexible duct (especially the plastic type ... Use a long brush to clean the dryer vent screen, then vacuum it ...