Come and visit the ACU Stand at the annual MVSSA conference in the Senate room at Emperors Palace, 6th and 7th of June 2024!



Keep it cool with our Mobile Air-Cooling Unit

Cooling Units that redefine mine ventilation

Keep it cool with our Mobile
Air-Cooling Unit

Cooling Units that redefine mine ventilation

Who we are

Applying fundamental knowledge for cutting-edge solutions

The Air Cooling Unit by M-Tech Industrial leverages the working principles of our heat pump technology to provide specialized spot cooling solutions to unique ventilation and cooling challenges encountered in the underground mining environment

Our Vision:

ACU’s Vision is to provide our customers with state of the art Spot cooling solutions driven by engineering principles and a drive for continuous improvement

Our Mission:

We achieve this by creating exceptional value by utilising  our in-house and consulting technical expertise and providing service excellence.

Our Values:

We realise our Vision and Mission by measuring ourselves against our core values of integrity, respect, humility, positivity and commitment in everything we do.

What we do

One team, one dream - collaboration at its finest




-Operations Manager
-Engineering Oversight
-Qualified and experienced artisans
-Quality Control
Learn more


Engineering, design and reporting

Engineering, Design and Reporting

-Dedicated ACU Product Engineer
-Dedicated engineering design team
-State of the art Data logging and reporting
Learn more


ACU Business Unit

ACU Business Unit

-Business Unit Manager
(Pr. Eng)
-Sales Manager
-Project support office
Learn more


Quality control

Quality control

-ISO accredited
Quality Program
-Compliance office
Learn more


Maintenance and services

Maintenance and services

-Qualified Fridge Mechanics and Technicians
-More than 50 Years collective experience
-Dedicated On Site teams (24/7)
Learn more

Pioneers of Progress: The History of ACU

Looking back on almost 15+ years in the industry, we are equally proud and grateful for the ongoing progress and innovation of the ACU-unit.

Cooling Where You Need It Most: Ventilation solutions that enables your production environment Valued Clients

Units sold
0 +
Megawatt cooling delivered daily
0 +

Valued clients

Clients that have experienced mine ventilation like never before.

ACU at a glance

Keep it cool with ACU

Proof is in the numbers. These numbers show how ACU have changed mine cooling for the better

Units sold
0 +
Megawatt cooled daily
0 +
Years` experience
Info Hub

Latest Publications

Operational advantages of mobile refrigeration

A closer look at the advantages of using the ACU in a closed loop heat rejection configuration.

Monitoring air cooling units in remote underground areas

A deeper look at the operational advantages of monitoring air cooling units in remote underground areas.

Maximising spot cooling potential

Looking at maximising spot cooling potential when utilising varying mine service water as heat sink.
Need Help?

Utilise our knowledge for cutting-edge solutions.

Contact us for mine ventilation solutions, service and support like never before.

Get in Touch

Get in touch

Send us a message and we will contact you!

Discover leading technology and customised solutions in line with industry needs

Improved production environment

We provide you with unparallel expertise and trusted advice, ensuring our clients reap maximum benefits.

Enabler of production

In the mining production environment, the ACU has been proven to enable more blasts per month, maximizing your earning potential.

Superior support

We go above and beyond to provide exceptional support, ensuring unparalleled assistance, prompt service, and a seamless experience for all clients

M-Tech is founded as M-Tech Mechanical
Enerflow founded
First Flownet License
First major consulting contract

Peoble bed modular reactor

Flownet redevelopment started
Rebranded to M-tech industrial ISO 9001 certification
Development of EMC80 starts + testing at Harmony gold Elandsrand mine (RAW 3222m underground)
Patented mobile deep mine cooling unit (ACU)
ACU100 – R134 changed to R407c
1st 100kW ACU @DRD 5#
ACU300 start design
1st trials 300kW ACU @Mponeng 

1st trials 250kW ACU @Mponeng

Sub Label
1st 2 x ACU300 sold Simmer & Jack MK1/50 sold to Impala

Enterprise development intiative

Sub Label
Launch Enerflow installations

Enterprise development intiative

6 x 250kW ACU @Beatrix 4# 

1st 6 x 250 kW ACU @Beatrix 4#

Sub Label
First Energy Effcient BOOT project @Sibanye Beatrix
Sub Label
100th ACU commissioned Dedicated On site OEM team
Sub Label
ACU Titanium R&D start
Sub Label
ACU MK2/50@SBP Spud #