FAB Expansion Joint

  • Cost efficient for large ducting applications
  • Lower initial cost compared to a metal expansion joint
  • Lower repair/replacement cost compared to a metal expansion joint
  • Can be installed over existing metal expansion joints
  • Negligible spring forces
  • Large movement capacity
  • Can absorb movements in multiple planes
  • No size limit (large fabric expansion joints can be provided in multiple pieces)
  • Bolt-in or weld-in

Flexibility and range of motion in small areas in ducting systems, low pressure, or other applications where lower cost and range of motion, can make them a better fit than a metal expansion joint.

Operating Range
  • Up to ±5psig depending on applications

Belt materials

  • Teflon
  • Darlyn
  • Viton
  • EPDM
  • Composite Teflon

Frame materials

  • A36
  • A588 (Corten)
  • A516/70
  • Stainless steel
  • Other alloys
  • Belts are attached by bolting to angle or plate flanges, or duct sections.
  • End connections may conform to ducting sizes, or customer designed.
  • Fittings may be the same at each end or different.
  • Corners are typically 90 degree, but may also be rounded.
  • One rectangular flow area non-metallic belt.
  • Typical dimensions of 12” x 12” minimum, up to 240” square. Overall length may vary, typically within the range of 12” to 48”.
  • Additional accessories maybe incorporated such as load
    bearing restraints, movement limiters, protection devices.
  • Absorbs ducting thermal or vibratory movement, primarily axial and lateral.
  • Movement amplitude varies, typically within the range of 1/4” to 10”.
  • Movement frequency typically is low cycle (1 to 100 cycles per year).