Scrubber Systems

Control and supress mine dust – including respirable dust particles – easily, efficiently and effectively.

CDC scrubber system applications

CDC manufactures a proven range of onboard wet and dry fan scrubber systems and offboard scrubber systems for surface and underground mining, 

Available with electric- or hydraulic-driven fan motors, onboard scrubber units are designed to reduce and manage mine dust stemming from continuous miner and road header drilling applications. They are also used at tipping points and with long haul stage loaders

Our offboard scrubber units are used in any location within a mine site, and all scrubber systems are tailored to suit client-specific requirements

Wet & dry fan scrubbers

Wet fan scrubber systems, which CDC developed in the late 1980s and subsequently refined, are part of our standard offering. CDC used the CSIR Aerotech Division’s computer simulation programs to design a high efficiency, low inertia axial fan driven by a custom-built water cooled electric motor.

The main advantage of wet over dry fan systems is that the wet fan acts as a dynamic scrubber. In addition, fine water droplets produced by fan turbulence make it particularly efficient in capturing respirable dust particles. This makes a significant contribution to mine health and safety in dusty above- or below-ground environments.

Dry fan scrubber units are custom-designed and fabricated on demand.

Why we recommend using a wet fan scrubber:

Wet Scrubber Fan

Operates similarly to a bifurcated system

Water cooled motor

Easily handles high dust loads

Has less internal system resistance

Compact size & weights less than a dry unit

Fan upstream from scrubber box (entrains more debris & liquid in air flow)

Dry Scrubber Fan

High maintenance slurry pump required

Filter screen clogs easily

Provides only low performance in high dust loads

Requires large quantities of water

Larger & heavier than wet unit

Fan downstream from scrubber box (entrains less debris & liquid in air flow)

Speak to a CDC expert about your dry or wet scrubber fan requirements. 

Wet fan scrubbers

Developed by CDC, the company used the CSIR Aerotech Division’s computer simulation programs. This helped to design a high efficiency, low inertia axial fan driven by a custom-built water cooled electric motor. 

This motor is its key differentiator, focusing on high start/stop applications, which allows for the inrush of currents. With a choice of side or rear outlets, the range is available in 5 variations (CDC 550, 600, 700, 760 & 825) to suit customers’ power, air volume and flow requirements.

  • Air volumes of 4 m³ to 25 m³/sec, model dependent
  • Air flow rates increased beyond 25 m³/sec on fit-for-purpose designs
  • Water flow rates from 1 to 60 l/min
  • Pipe diameters from 360 to 1 016 mm
  • Fan designed to optimise efficiencies & noise levels

Wet fan scrubber box

Encased within the scrubber box, the computer-designed impeller provides low inertia, low noise and high efficiency. The in-line water cooled motor is compact and has reduced noise levels, while the multi-layer stainless steel screen (with highly efficient mist eliminator) offers high particle arrestance and low resistance.
Easy to install and maintain, the range offers the following additional benefits.

  • Compact & lightweight
  • Low power requirements & low water consumption
  • High performance & efficiency
  • Fast change out of fan assembly

Double-mounted scrubbers

Incorporating all the features of conventional wet fan scrubbers, double-mounted units are used when smaller units are fitted to accommodate space constraints, but increased power & functionality are required.

Offboard scrubber system

Our offboard scrubber units are designed to be used anywhere onsite, and incorporate a control system which is essential in helping eliminate failures. It prevents equipment failure by tripping the scrubber system and alerting operators when:

  • air or water is unable to pass through the scrubber, and
  • if the screen is blocked for whatever reason

To ensure the offboard scrubber system’s temperature remains within acceptable parameters, the misters used in the scrubber motors are designed to monitor the motor temperature. This allows for corrective action to be taken prior to temperature parameters being exceeded.

The following parameters should be monitored to ensure your scrubber system remains operational and downtime-free:

  • Motor bearing temperature
  • Motor winding
  • Temperature Water flow
  • Vibration levels
  • Slurry & water storage level indicators
CDC also manufactures Integrated Dust Suppression System for continuous miners.

Scrubber system composition & advantages


  • Housing: mild steel or stainless steel
  • Impellor: hardened, durable stainless steel
  • Electric motor: cast iron
  • Filter screen: stainless steel knitted mesh with galvanised option
  • Demister/water eliminator: plastic blades with barbs


The motor and fan system are designed for easy maintenance, with the motor / fan assembly changed in under an hour. The motor, fan, impeller and fan track are individually balanced to high tolerance levels to achieve interchangeability. Our entire scrubber range ensures reduced dust levels, minimising personnel exposure to dust-related lung diseases, and improves visibility which reduces incident probability and improves production rates. The single biggest advantage is the highly effective dust suppression, which decreases the probability of dust or methane ignitions.
  • Standard building time 10 to 15 days
  • Extremely compact size & long life
  • Large volumes in flow volumes
  • Can be tailored to customer spec (longer building time)

CDC – setting the standard for dust suppression technologies in open cast and underground mining.

Electric vs. hydraulic fans

All scrubber systems are available with either electric- or hydraulic-driven fans.

When considering the type of fan for your scrubber system, size and weight are important factors and must be considered alongside other factors such as performance, speed control and motor cooling. The electric fan is both longer and heavier than its hydraulic counterpart, but the key differentials to add to the equation are:

Electric Fan Hydraulic Fan
Speed Control Fixed Variable (oil flow control)
Speed Control Water cooled No external cooling required
Performance With the same impeller and stator used, there is no difference in performance.

24 hour service support (incl. service exchange units)

CDC is committed to 24-hour, 7-days-a-week support with service exchange units for pumps and fans together with fast repair turnaround times. All repairs are conducted in our own workshop. When you fit CDC equipment, you also get 100% commitment for round-the-clock field support. Our customer support engineers and service technicians are always available to assist you in the supply, operation and maintenance of all CDC dust suppression equipment.

We tailor all our equipment to suit clients’ exact specifications.

Speak to a dust control specialist: