Flexible Ductwork – Glossary
Flexible ductwork is a bendable, accordion-style ventilation pipe made from wire coil covered with plastic or foil, commonly used to connect dryers to main vent lines where rigid metal ducts are impractical.
Flexible ductwork refers to bendable ventilation piping used in dryer vent systems and HVAC applications. This type of duct consists of a wire coil frame covered with layers of plastic, foil, or fabric material that allows it to bend and curve around obstacles while maintaining an open airflow path.
Construction and Materials
Most flexible dryer vent ducts feature a spring-wire helix core wrapped in aluminum foil or plastic laminate. The corrugated, accordion-like design allows the duct to compress, extend, and bend to navigate tight spaces and awkward angles. Commercial-grade versions may include additional layers of insulation or fire-resistant materials for enhanced safety.
Common Applications
Flexible ductwork serves several purposes in commercial and residential settings:
- Connecting dryers to main exhaust vents in laundromats and commercial laundry facilities
- Bridging gaps between rigid metal duct sections
- Navigating around structural obstacles like beams, pipes, or electrical conduits
- Temporary installations or situations requiring frequent repositioning of equipment
- Retrofit projects where rigid ductwork installation proves difficult
Performance Considerations
While flexible ductwork offers installation convenience, it comes with performance trade-offs. The ribbed interior surface creates more airflow resistance than smooth rigid metal ducts, reducing dryer efficiency and increasing drying times. Lint accumulates more readily in the ridges and valleys of flexible ducts, requiring more frequent cleaning to maintain safe operation.
Building codes in many jurisdictions limit the length of flexible ductwork permitted in dryer vent systems, typically restricting it to short transition sections of 8 feet or less. Extended runs of flexible duct can sag when not properly supported, creating low spots where lint and moisture collect.
Maintenance Requirements
Flexible ductwork demands regular inspection and cleaning. The material can deteriorate over time from heat exposure, developing holes or separating at connection points. Professional vent cleaning services use specialized tools to navigate the curves and thoroughly remove lint buildup without damaging the flexible material. Proper installation with minimal bends and adequate support extends the service life and maintains airflow efficiency.
