AL20 – AL 42 Large Fans


performance range



Axial-flow impeller as cast part from EN AB 43000, with individually adjustable profiled impeller blades with no edges in the flow surface, with guide vanes, sturdy steel housing, foot mounting


Direct start, variable speed (FU) with softstarter or frequency converter


Voltage ranges 400-10,000 Volt


Primer with top coat, alkyd resin Silac,

total layer thickness min. 180 μm

Standard colour: Pure white (RAL9010)


Sealed motor, dust disks, hard coated impeller, special coating, vibration dampers, stall-point monitoring, VFD compatibility,
cold environment, motor monitoring, incr. efficiency class,
vibration sensors, volume flow, pressure difference and gas monitoring, adjustable blades


Technical execution according to

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

Version with explosion protection

PROTECTION CLASS: Fire-damp proof*, explosion-proof*

TYPE: dAL20 to dAL42
Optional: Motor outside the airflow
Spark-protection, thrust collar made of silumin or brass

ACCORDING TO: Directive 2014/34/EU

* also available according to international explosion protection regulations

Main Mine fan Systems

Mine Requirements » Customised solutions

Design » High reliability

Systems » Flexible and versatile in use Innovative special solutions Highly efficient

Our customised engineering services
cover a wide range of services:

  • Establishing the specifications
  • Design of the systems
  • Overall project planning
  • Commissioning
  • Aerodynamic performance test
  • Vibration analysis
  • Noise testing
  • Fine balancing on site
  • Maintenance/maintenance support

We offer turnkey services for all devices.

We plan according to your specifications and requirements:

  • Production System design
  • Drives and power supply
  • Trace heating and cooling
  • Control and visualisation
  • Comprehensive instrumentation and monitoring

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.