EST4-15 to EST9-500


EST4-15 to EST9-500

Performance range



Axial-flow impeller as cast part made of EN AB 43000 with smallest blades on the outer ring, turbine nozzle for compressed air drive. Thrust collar made of EN AB 43000 spark protected. With guide vanes, profiled rotor blades with no edges in the flow surface, sturdy steel housing, foot mounting.

Including: Sealed motor, impact protection


Direct, star-delta or stepless via compressed air


  • Voltage ranges 400 – 1140 Volt
    Three-phase AC squirrel-cage motors S1
                                      in special design
  • Flame-proof enclosure protection
    “d” or “de” according to DIN EN 60079-1
  • Protection class >= IP 55; insulation class F, tropicalised,
                                            permanently lubricated
  • Energy efficiency class >= IE2
  • Terminal box position: top
  • Operating pressure with compressed air drive: 4 – 6 bar


Primer with top coat, alkyd resin Silac,
total layer thickness min. 180 μm

Standard colour: Pure white (RAL9010)


Dust disks, hard-coated impeller, special coating, vibration dampers, VFD compatibility, cold environment, motor monitoring, vibration sensors, volume flow, pressure difference, adjustable blades, bifurcated fan

Technical execution according to

Machinery Directive: Directive 2006/42/EC
ErP ecodesign Directive 2009 / 125 / EC
Explosion protection according to guideline 2014 / 34 / EU
Test bench run according to DIN EN ISO 5801 / 2017

English Version of our Website ist coming soon …

What we do

Customer oriented and innovative solutions for the health of your employees

Ventilating and Exhausting Systems for:

  • Mining of any kind
  • Tunnel Construction
  • Road Construction
  • Underground Irrigation and Cavern Systems
  • Special Construction

Breathe the Difference

Our highly qualified expert team of engineers will not only continue to the longstanding tradition of the KORFMANN quality and performance in the field of ventilation for mining and tunneling, underground systems of any kind and industrial sectors, but also increase it to the advantage of your company.

Due to our high affinity for technology, we find the perfect solution for your requirements – no matter in which area. The innovative spirit of our engineers helps us to continuously develop our products and offer you solutions and products also related to industry 4.0.

You can be absolutely certain to have Korfmann Lufttechnik GmbH as a reliable partner at your side. We look forward to convincing you of our efficiency and ability to supply the best product for your future projects.