The dirt and debris clogged in the duct and dryer vent can contain flammable fibers and hair. Clogging can further cause overheating of the dryer element, which can increase the risk of fire. An overworking heating unit, when combined with circulating flammable material, can create the perfect environment for fire.
Most homeowners never realize the potential threat of fire due to clogged ductwork and dryer vent. You can ask your home air duct cleaning company to clean the duct and dryer vent. Just like the furnace, any obstruction in the dryer vent is going to force the dryer to work longer and harder.