7.2 Lint Buildup: The Primary Cause of Extended Drying Times

Lint accumulation represents the single most common cause of extended drying times, contributing to an estimated 75% of drying performance complaints. Lint forms when fabric fibers break loose during washing and drying cycles, creating a fine, highly flammable material that can quickly accumulate in critical airflow areas. Even small amounts of lint can significantly restrict airflow, forcing the dryer to work harder and longer to achieve proper drying.

The lint filter captures most lint during normal operation, but significant amounts bypass the filter and accumulate in internal air passages, the blower housing, exhaust ducts, and external vent areas. This buildup creates progressive airflow restriction that worsens over time, gradually extending drying cycles until performance becomes unacceptable.

Internal lint accumulation occurs in several critical areas often overlooked during routine maintenance. The lint filter housing collects lint that passes around the filter edges or through damaged filter mesh. The blower wheel and housing accumulate lint mixed with moisture, creating dense clogs that severely restrict air movement. Heat exchanger surfaces collect lint that reduces heat transfer efficiency, requiring longer heating periods for equivalent performance.

External exhaust system lint buildup creates back-pressure that reduces air movement throughout the system. Lint accumulates at duct joints, bends, and restrictions, with the external vent hood often showing visible lint discharge during operation when internal accumulation becomes significant. Long duct runs and multiple bends exacerbate this problem by providing more surfaces for lint collection.

Symptoms of lint-related performance problems include gradually increasing drying times, clothes remaining damp in certain areas, excessive lint visible around the dryer or in the laundry room, reduced airflow at the external vent, and frequent overheating shutdowns triggered by high-limit thermostats or thermal fuses.

Comprehensive lint removal requires both external and internal cleaning procedures. External duct cleaning involves disconnecting the dryer, removing duct sections for cleaning, and using specialized brushes or vacuum attachments to remove accumulated lint. Professional duct cleaning services typically charge $100-200 but may be necessary for complex duct systems or severe buildup.

Internal cleaning requires partial dryer disassembly to access lint accumulation areas. Remove the lint filter and clean the housing with vacuum and brush attachments. Access the blower housing through service panels and remove accumulated lint carefully, ensuring proper reassembly of all components. Clean heat exchanger surfaces and internal air passages following manufacturer procedures.

Prevention of lint accumulation involves proper filter maintenance, regular duct inspection and cleaning, appropriate fabric softener use (which can increase lint production), and proper sorting to separate lint-producing fabrics from lint-attracting materials like corduroy or fleece.