Clogs -If your clothes dryer vent is obstructed or poorly installed, moisture can condense into swimming pools of water in the dryer vent. It then combines with excess lint, developing a maché that adheres to the vent walls. This not just blocks the vent further, however also produces best conditions for mold and mildew to grow.Lint accumulation is also a common cause for dryer vent leaks and mold development. A clothes dryer vent obstructed with lint blocks air flow. Moist air tired by the clothes dryer condenses and might lead to a water leakage. Moisture from the water leakage can enable mold development to happen.