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Flexibles for hazardous area Zone 1 & Zone 21

Ex db / Ex tb – IP66/67

The flexible couplings series FNN, supplied in length as specified by customers, are made of a flexible conduit in stainless steel AISI 321 with a braid in stainless steel AISI 304 wires. All terminal unions of flexible conduit are made of Fe 37-UNI 7070 steel and T.I.G. welded.

On request a PVC coating for the optimized protection of the conduit against aggressive chemical agents is available. However, such a coating causes a considerable reduction of conduit flexibility, while it increases the minimum bending radius.

Flexibles are recomended for fixed connections and/or when light vibrations may occur.


  • Type of protection: Ex db / Ex tb

  • Degree of protection: IP66 / 67

  • Certified for:

    • Gas group IIC
    • Dust group IIIC
  • Max range ambient temperature: -50°C ÷ +80°C

  • Operating temperature: -50°C ÷ +450°C

  • Materials used:

    • Flexible Pipe: Stainless Steel AISI 304/321
    • Fittings: Steel (FE 37-UNI 7070)
  • Flexible pipe internal usable diameter: 11 mm up 100 mm

  • Fittings threading diameter: 1/2” up to 4”

  • Weight: 290 g/m up to 4200 g/m

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