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All pricing inquiries should be made by calling (419) 483-7690 ext. 223, or by emailing

International Flexible Metallic Tubing Plenum Rated/Liquid-Tight (UL Listed Galvanized Steel, Type FMT)

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  • Steel construction
  • Premium hot dip galvanized zinc coating
  • Superior corrosion resistance
  • Smooth interior for easy wire pull-thru
  • Liquid-Tight to protect wiring from moisture
  • Smoke-tight to contain toxic vapors in raceway so they can't leak into air handling spaces and/or plenum ceilings
  • RoHS WEEE compliant
  • Listed Liquid-Tight connectors readily available
  • For fixture whips, lighting applications and other modular wiring assemblies where the tubing will be flexed infrequently after installation, pull-thru NEC Article 300.22 (c)
  • Complies with UL-360 File Number E180076, NEC Article 360 Flexible Metallic Tubing and Federal Specification WW-C-566C
  • Available in 4 ft. and 6 ft. lengths
  • City of Chicago approved


International Flexible Metallic Tubing is a raceway for electric conductors that is circular in cross section, flexible, metallic and Liquid-Tight without a nonmetallic jacket. Lengths in use are limited to 6 feet. For use in dry and accessible locations where protected from physical damage or concealed in ductwork or plenums, such as above suspended ceilings; for 1000 volts maximum; and in branch circuits.


The number of conductors permitted in 3/8-inch trade size shall not e exceed that permitted in NEC Table 350-4. Conductors in 1/2-inch and 3/4-inch trade sizes shall not exceed the percentage of fill specified in NEC Table 1, Chapter 9.


Trade Size and Catalog Number Acceptable Internal Diameter Acceptable External Diameter Nominal Min. Radius Flexing Use Min. Radius Fixed Bends Approx. Weight of 100 ft. (Lbs)
Min Max
FMT-3/8 .484 .504 .675 10" 3.5" 13
FMT-1/2 .622 .642 .800 12.5" 4" 16

Available in units cut to 4 ft. and 6 ft. lengths. Consult factory for custom lengths and additional sizes.


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