Single Inlet Centrifugal fans

SI-BACK C fans are designed for installations requiring modest air deliveries with relatively high pressures, in duct mounted applications. For instance: exhausting and filtering of industrial plants, pneumatic conveyance, transport of solid material mixed with air, sawdust and woodchips).

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This line consists of 12 sizes with impeller diameter from 700 up to 1150 mm.

  • Rigid Construction In Enamelled Sheet Metal And The Thickness Of The Materials.
  • Solution For Many Ventilation Problems, Explosion Proof Version ( Atex Type)
  • 150c Continuous Operation, Recommended For Kitchen Application
  • Fans Scroll With Different Rotation Angles.

Size Range (mm)

Motor (Kw)

Capacity (LPS)


0.18- 4 Kw

310-3,650 LPS

SI-BACK C line is characterized by the extreme sturdiness due to the rigid construction in enameled sheet metal and the thickness of the materials.
Another feature is the variety of models and versions composing the series.


  • Volute in epoxy painted enameled steel sheet. Fixing flanges according to UNI EN ISO 1335/Tab.1. Standards.
  • High efficiency backward curved blade impeller. Balancing according to UNI ISO 21940-11.
  • Asynchronous three or single phase, electric motor, protection IP 55, insulation class F, service S1, mounting type B3 or B5, construction according to IEC/EEC (UNEL MEC).
  • Arrangement 4 or 5 (impeller directly coupled to motor shaft); arrangement 1, 9, 12 (belt driven, with impeller coupled to the motor by mean of transmission).

SI-BACK C standard

  • Conveyed air: very dusty, conveyance solid materials.
  • Temperature of conveyed air: -20°C / +60°C.
  • Voltage:
  1. Three phase version (T) 400V – 50Hz.
  2. Single phase version (M) 230V – 50Hz


  • SI-BACK C arrangement 4: impeller directly coupled to motor shaft, motor placed on the motor support.
  • SI-BACK C arrangement 5: impeller directly coupled to motor shaft, motor flanged on the fan volute. 


  • Inlet protection grid (IPG-SBC) (Necessary for use in free air)
  • Outlet protection grid (OPG-SBC) (Necessary for use in free air)
  • Inlet flexible joint (IFC-SBC)
  • Outlet flexible joint (OFC-SBC)
  • Inlet counter flange (ICF-SBC).
  • Outlet counter flange (OCF-SBC).
  • Inspection door (ID-SBC).
  • AV mounts (AM).
  • Condensation drain hole (CD)


  • Explosion proof versions (SI-BACK C Atex).
  • Stainless steel version.
  • High temperature version (150°C for direct coupling and 300°C for belt coupling version).





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