Clogs – If your dryer vent is clogged, moisture can condense into pools of water in the dryer vent. It then mixes with excess lint, creating a maché that sticks to the vent walls. This not only clogs the vent further, but also creates perfect conditions for mold and mildew to grow.
Leaks – Lint buildup is also a common cause for dryer vent leaks and mold growth. If a vent is clogged and the moisture cannot pass through, it will often begin to leak out of vent joints or cracks. This not only means there is water accumulating inside the vent creating the ideal conditions for mold growth within, but water or moisture escaping into the laundry room and home can facilitate mold growth outside of the vent line as well.