A commercial heat exchanger created in the lab to work in the real world.

Traditional heat recovery systems are not designed to cope with the dirty air they process. We went back to the drawing board and developed a commercial heat exchanger that can.​

DexThermic with drawer open

DexThermic is a Dirty Air Heat Exchanger (DAHX)® with a unique design, developed from scratch using state-of-the-art computational modelling techniques, analytical methods, experimental validation and engineering manufacturing techniques… a challenging, in-depth, scientific process to produce a commercial heat exchanger that, quite simply, works as hard as you do.

Created for installation within contaminated air extract systems, DexThermic recovers waste heat from processes where conventional heat recovery methods foul up and are prone to failure.



Six years in development. Product of an extensive UKRI research project.


Can be combined in a variety of configurations to suit your needs.


Our uncompromising commitment to quality ensures longevity and reliability.


Core technology allows individual part replacement with minimal disruption.

Explore some of the DexThermic components below:

DexThermic unit with the drawer open
Main Body
  • Modular design can be combined in multiple configurations to suit site requirements
  • Flexible mounting options - wall or ceiling supported
  • Incorporated drain allows washdown waste during cleaning to be drained to the restaurant’s grease trap
  • Optional insulation to suit site requirements
  • Unit fully lockable - access only for appropriate personnel
  • Easy clean and service - designed for convenient access to heat exchange core
  • Incorporated drain for condensate and contaminants - washdown waste from cleaning can drain to the restaurant’s grease trap
  • Optional insulation to suit site requirements
Cassette Drawer Slides
  • High performance slides for extended life, located external to the airstream and contamination zones
Unique Fin Panel Heat Exchange Core
  • Low Air Pressure drop design enables lower Specific Fan Power (SPF) requirements
  • Fluid Fin Panel (FFP) design simplifies thermal path and minimises physical obstructions in the air stream, reducing the physical barriers that cause fouling and blockages
  • Comparable performance - the core design utilises a longer air flow channel compared to fin and coil heat exchangers allowing space for the core FFP technology to function efficiently
  • Quick access design for on-site service and cleaning

Find out more

UniFlow Fluid Connections
  • Highly configurable fluid handling system - unit can be left or right-handed to suit site requirements
Incorporated drain for condensation and contaminants
DexThermic unit viewed from the rear with the CAU open
Control Box
  • Flexible Mounting Options - has provision for mounting on the main body or custom site location
  • Contained Control - neat solution to housing all control and data I/O components
Main Unit Fluid Connections
  • Hydronic System Connections – Heatpump and Runaround Coil compatible
Mounting option for ceiling using standard components
Mounting option for floor using standard components

How Does DexThermic Work?

The DexThermic product range is specifically designed to provide heat for:
Discover the exceptional benefits of installing the DexThermic DAHX commercial heat exchanger:
  • Seamless Retrofit: Designed for hassle-free installation into existing extract systems, our heat exchanger minimally affects specific fan power requirements.
  • Low Air Pressure Drop and Enhanced Air Flow: it features a low air pressure drop design with an increased air passage ratio. This minimizes physical obstructions in the air stream, allowing for optimal heat transfer.
  • Optimised Heat Transfer: The DexThermic DAHX promotes heat transfer through the creation of complex turbulent flow regimes. This stimulation occurs both externally and internally on the recovery surface, resulting in optimised heat transfer and improved resistance to fouling.
  • Fouling Resistance: The recovery Fin Panels are equipped with a cushion of air that encourages particulate matter to stay away from the surface, reducing fouling and ensuring long-lasting performance.
A conventional commercial heat exchanger tends to clog up and fail over time.  To solve this problem, Dext went back to the drawing board, and back to university.

The state-of-the-art Fluid Fin Panel (FFP) array is a product of critical thinking, scientific method, validation and extensive testing.

We reimagined the fin and tube heat exchanger by removing the tubes and enabling the fins to carry the heat transfer fluid.

Explore a real life example of DexThermic in action.

Our Core Technology

We carefully balanced the trade-offs between heat transfer rate, pressure drop, and overall surface area to create our unique Fluid Fin Panel (FFP) array. By applying fundamental principles of physics and design found in Tube Coil and Finned Tube Coil Heat Exchangers, we developed a solution that reduces fouling and particle resistance on the air-side.

en_GBEnglish (UK)