What Causes a Clogged Dryer Vent?
Simply stated, a clogged dryer vent is caused by the build-up of lint in the dryer
ventilation system. There are many reasons a clothes dryer vent may become clogged.
First, the complex construction of new homes built today tends to have dryers located
away from an outside wall. This means dryers tend to be vented longer distances
creating more bends in the vent through the home. The additional length creates
more places for lint to collect or for animals and birds to hide. Secondly, dryer
vents are often made from flexible plastic or foil duct, which may be easily kinked
or crushed where they exit the dryer and enter the wall or floor. Ducts made of
this material are more likely to sag and let lint build up at low points than ridge
metal or UL approved flexible metal ducts. Poorly connected internal ducts can also
trap lint. Screens or cages at the duct termination are helpful to prevent animals
from getting into the exhaust from the outside, but if they are not properly cleaned
and maintained they can also become clogged and restrict air flow.