The vent should have a flap (or flaps) at the end to stop air infiltration (see photos). Go outside ... a utility knife, ...

The laundry room gets humid or has restricted air flow when you run the dryer. (The hot air may be seeping into the room instead of escaping through the outside vent if there is an obstruction in ...

How to Clean a Dryer Vent From the Inside If your dryer is easy to move and your vent is easy to access, try cleaning it from ...