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Cabin HVAC DM1

The Cabin HVAC DM1 is a compact, all-electric cabin demister designed for heavy-duty on-highway and off-highway vehicles.

Delivering 1.25 kW of clean, instant heat via a self-regulating PTC element and brushless blower, it provides reliable windscreen demist in demanding, high-humidity environments. Lightweight, durable and easy to install, the DM1 is proven across thousands of global applications and ideal for hybrid and electric vehicles.

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Overview

Clear visibility is critical for safe vehicle operation, especially in challenging, high-humidity conditions. The DM1 delivers fast, focused demist performance using a self-regulating PTC heater, two-speed brushless blower and an integrated controller to direct heated airflow to the windscreen.

Its compact under-dash form ensures an easy installation for new designs or retrofit projects, without the complexity of water-based heating circuits.

Built from lightweight aluminium for durability and long service life, the DM1 provides consistent heating performance from a 24 V DC supply.

With proven reliability across thousands of vehicles, it is a dependable cabin demist solution for hybrid and full-electric platforms.

Features

The product’s features are designed to optimise performance through design and functional efficiency.

  • 1.25 kW Self-Regulating PTC Heater: Provides clean, instant heat without overheating risk, ideal for electric and hybrid vehicles.
  • Two-Speed Brushless Blower: Efficient, low-maintenance airflow delivery with selectable performance for different visibility conditions
  • Direct Air Distribution: Allows targeted demist to the windscreen, improving driver safety.
  • Compact Under-Dash Design: Fits easily into tight cabin spaces, supporting OEM packaging constraints and retrofit applications.
  • Lightweight Aluminium Frame: Reduces overall system weight while maintaining durability for long operational life.
  • Integrated Controller: Ensures reliable, straightforward operation and seamless integration into vehicle electrical systems.
  • 30-Minute Active Timer: Prevents unnecessary energy draw and offers safe, controlled heating cycles.
  • All-Electric Solution (24 V DC): Eliminates water plumbing, simplifying installation and reducing maintenance.
  • Service-Friendly Layout: Provides easy access for seasonal maintenance or filter checks.
  • Custom Modifications Available: Enables OEM-specific dimensional, airflow or connection changes.
Technical

The product is formed by a set of technical characteristics that determine its performance and operation.

  • Dimensions (L x W x D): 300 x 435 x 148.5 mm
  • Weight: 6.8kg
  • Max heating capacity: 1.25kW
  • Max airflow:727 m³/h @ 0 static pressure
  • Supply Voltage: 24V DC (max current: 60A)
  • Connection: 3-way AMP Superseal 282105-1
  • Number of speeds: 2-speed
  • EMC approved: TBC
  • Frame material: Aluminium
  • Safety: Thermal cut-out fitted as standard
Airflow Option

Two Speeds

Driver can tailor the airflow to their requirements.
Heating Capacity

1.25kW

Fast, reliable demist performance suitable for hybrid and electric applications.
Lightweight

6.8kg

Lightweight aluminium assembly provides long-term durability.
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 DM1 for effective windscreen demisting.

Fast, Effective Demisting

PTC heat and focused airflow clear windscreens quickly in humid or cold conditions.

Optimised for Electric Platforms

All-electric heating removes the need for coolant plumbing, reducing system complexity and weight.

Proven Reliability

Thousands of units installed globally, delivering long service life with minimal maintenance.

Easy Integration and Retrofit

Compact form, simple wiring and no water circuits make the DM1 straightforward to adopt in various vehicle architectures.

Customisable for OEM Requirements

Options for modified airflow, mounting, and electrical interfaces to support specific vehicle platforms.

Contact Us

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Supporting OEMs from Start to Finish

Grayson provides full end-to-end capabilities, from design and testing to manufacturing and integration, to deliver complete thermal solutions. Learn More

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Grayson Thermal Systems has been supporting vehicle manufacturers and operators with heating and cooling expertise for over four decades. Our focus remains on dependable systems and long-term value.