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Cabin HVAC DM2

Grayson Cabin HVAC DM2 is a compact, coolant-fed demister designed for internal combustion engine vehicles requiring reliable windscreen demist and driver heating.

Using a lightweight aluminium heater coil and long-life brushless blower, the DM2 delivers up to 7 kW of heat for consistent performance in cold or high-humidity conditions. Its durable construction, integrated filtration and simple installation make it a dependable choice for a wide range of heavy-duty applications.

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Overview

The Cabin HVAC DM2 provides fast, efficient heating and windscreen demist performance using engine coolant as its heat source, making it ideal for internal combustion engine vehicles.

Heat is transferred through a lightweight aluminium heater coil, while a long-life brushless blower delivers controlled airflow to the windscreen or driver area. With a compact, robust design and integrated filtration system, the DM2 prevents dust and debris from blocking the heat exchanger or blower, maintaining reliable performance over time.

It supports applications needing supplementary driver heat, a dedicated demister solution or both, offering flexibility across on-highway and off-highway vehicles. Its durable aluminium frame and low-maintenance design ensure a long operational life in demanding environments.

Features

A combination of functional features enables the product to operate efficiently and consistently.

  • Coolant-Fed Aluminium Heater Coil: Delivers up to 7 kW of heat for strong demist performance using existing vehicle coolant circuits.
  • Long-Life Brushless Blower: Provides dependable airflow with reduced maintenance needs.
  • Twin-Scroll Blower Design: Ensures smooth, efficient air delivery to maintain visibility and driver comfort.
  • Integrated Debris Filter Tray: Prevents blockages and protects internal components for long-term reliability.
  • Air Filter System: Minimises dust build-up, maintaining heat transfer efficiency and airflow stability.
  • Compact, Durable Aluminium Frame: Easy to package in tight spaces while withstanding tough duty cycles.
  • Ideal for Driver Comfort Boost: Can provide direct warm airflow to the cabin as needed.
  • Simple Coolant Integration: Compatible with standard engine coolant loops for straightforward installation.
Technical

The following technical elements make up the core structure and performance of the product.

  • Dimensions (L x W x D): 525 x 440 x 220 mm
  • Weight: 8.85kg
  • Maximum Heating Capacity: 7kW
  • Coolant Requirements: Min. flow 12 L/min; Min. temp 75°C; Max pressure 2 bar
  • Blower: Twin-scroll, 1-speed, brushless
  • Ambient Operating Range: –25°C to +50°C
  • Construction: Aluminium frame with integrated filtration
Airflow Performance

Twin-Scroll Blower

Brushless blower delivers smooth, reliable airflow with long service life.
Heating Capacity

7kW

High, consistent thermal performance for fast demisting and driver comfort.
Coolant Requirements

12 L/m Flow, 75°C Min

Optimised for ICE coolant circuits to ensure stable heating performance.
Supply Voltage

24V DC

Compatible with common heavy-vehicle electrical architectures and straightforward to integrate.
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Compatible Applications

Product Benefits​

Discover why leading on-highway and off-highway OEMs choose the DM2 for effective windscreen demisting.

Strong Demist and Heating Performance

High-capacity heat output ensures clear visibility and warm cabin conditions in extreme environments.

Optimised for Internal Combustion Engine (ICE) Vehicles

Uses existing coolant circuits, reducing system complexity and installation effort.

Long-Life, Low-Maintenance Operation

Brushless blower and integrated filtration extend service intervals and protect airflow performance.

Flexible Air Distribution

Supports windscreen demist, driver heating or both depending on application needs.

Durable, Proven Construction

Aluminium design withstands heavy-duty operation and long service cycles across diverse sectors.

Contact Us

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Our Capabilities

Supporting OEMs from Source to Service

Grayson can provide full end-to-end support to OEMs, from expert design and in-depth testing to series manufacture and aftermarket services. Learn More

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Discover More About Grayson

For more than 40 years, Grayson Thermal Systems has delivered trusted heating and cooling solutions to global vehicle industries. Our experience ensures reliable operation in demanding environments.