Proper venting and regular maintenance makes for a more efficient and safer clothes drying experience. Hundreds of home fires and injuries occur each year as a result of excessive heat buildup in clothes dryers caused by blockage of the airflow through the dryer and/or the attached venting system. Most of these fires could easily be prevented with simple and regular maintenance.
Lint screens and compartments in the dryer should be checked and cleaned after each load. Lint should also be regularly removed from accessible points in the dryer vent hose connection and exterior vent cover periodically. Even with the regular cleaning of a dryer lint trap, it is possible for a significant amount of lint to accumulate at one or more points in the duct.
Vent system blockage also causes the dryer motor to work harder and possibly overheat. This excessive heat can result in the ignition of trapped lint or other combustible materials in or close to the duct or can prevent proper drying of the clothes - often the first sign of a problem with a dryer venting system.
The entire venting system should be periodically checked for damage, leakage, or blockage from lint, bird nests, rodents, etc. Any substantial blockage, whether from lint build-up or other restrictions in the vent hose or ductwork, such as crimped sections, undersized fittings, etc., will obstruct the airflow through the dryer as well as the venting system.
Lightweight, flexible plastic or aluminum vent materials are especially susceptible to blockage, damage, or burn though and are not considered acceptable for exhaust ducts. While more difficult to work with, solid, metal ductwork is the best option for dryer venting systems. Joints should be fitted and taped, but screws that protrude into the duct should not be used to hold sections together, as even one screw can be enough to catch some lint, allowing for a build-up that can eventually obstruct air flow.
At least annually, the vent duct should be disconnected and cleaned out along its entire length, including the exterior damper and cover and portions of the system within the dryer itself (with electric power off). The base of vertical sections will likely contain the most accumulated material.
Check your dryer manufacturer's installation and maintenance instructions for details on proper exhaust venting and the regular maintenance recommended.
Note: These tips are only general guidelines. Since each situation is different, contact a professional if you have questions about a specific issue. More home safety and maintenance information is available online at www.housemaster.com.