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Doing preventive maintenance service on your dryer prolongs its life and reduces the service done to it. An easy preventive maintenance you can do is to clean the dryer vent often and the lint filter after every drying cycle for safety and energy efficiency.
Most dryers consist of a rotating drum called a tumbler through which heated air is circulated to evaporate the moisture from the load, while traditional dryers could be electric or gas heat source. Moisture and lint are byproducts of the tumble drying process, and are pulled from the drum by a fan motor and then pushed through the remaining exhaust to the exterior termination fitting. Typical exhaust is a flex hose found immediately behind the dryer, the 4" rigid galvanized pipe and elbow fittings found within the wall framing, and the vent duct hood found outside the house.
A clean, unobstructed dryer vent improves the safety and efficiency of the dryer. As the dryer duct pipe becomes partially obstructed and filled with lint, drying time increases and causes the dryer to overheat and waste energy. In extreme cases, a blocked vent may result in a fire. Clothes dryers are one of the more costly home appliances to operate.
Several factors can contribute to or accelerate rapid lint build-up. These include long or restrictive ducts, bird or rodent nests in the ducting, crushed or kinked flex duct hose, ducting with screens, and condensation within the duct due to un-insulated ducts traveling through cold spaces, such as a crawl space or attic.