Air-On-Demand System

Automatic Fan Speed Controllers

Air-On-Demand System

Automatic Fan Speed Controllers

Our Air-On-Demand system comes with two distinct options for the control system; the basic Analogue Control System (ACS) or the Red Lion Digital Control System (RLDCS).  The table below the video highlights the features that each system offers. 


Item Red Lion Analogue System
Switch between man/auto/off Yes Yes
Change manual speed Yes Yes
Change direction of flow Yes Yes
Displays live data Yes No
Can be programmed into auto ship management system Yes No
Shows system status Yes No
Allows performance diagnostics to be viewed Yes No
Has real time data logging Yes No
Illuminates in low light situations Yes No
Available in DC No Yes

Our Variable Speed Drive "Air-On-Demand" systems has been developed in house specifically for marine engine room applications.


Our Air-On-Demand systems are fully bench tested and pre-programmed ready for installation. They come complete with a control switch panel which includes a fault light & also include a full wiring diagram to aid in installation. AC and DC versions are available.


These controllers are designed to be used either manually or via automation. You have the ability to control the fan speed to allow for more air flow when you need it and less when noise may be a challenge.


While both systems will allow you to switch between manual or automatic control mode and manually adjust the fan speed, the RLDCS includes additional features which allow you to optimise the systems operation. As such, it is recommended that the RLDCS is used. However, if you want a system that is cheaper and still allows for manual/auto control of your engine room fan, the Analogue Control System is the most suitable for you.

Air-On-Demand  Analogue Fan Speed Controller

Features Of Our Air-On-Demand (ANALOGUE)

  • Automated fan speed based on temperature
  • Ideal for tourism vessels where sound levels are important - ideal for reduce noise and power
  • Available in AC or DC options
  • AC available in 240V or 3Phase
Air-On-Demand  Fan Speed Controller

Features Of Our Air-On-Demand

  • Automated fan speed based on temperature
  • Ideal for tourism vessels where sound levels are important - ideal for reduce noise and power
  • Available in AC or DC options
  • AC available in 240V or 3Phase

Air-On-Demand Analogue - DC Version

Info about our DC AOD systems.

(Use this link for AC AOD Systems)

This Pulse Width Modulation (PWM) DC motor controller can provide up to a maximum continuous current of 76A to your DC motor or other DC load.

The controller has one mode of operation. FIXED frequency. The fixed frequency runs the controller at 100Hz. Duty cycle is fully adjustable from 0% to 100%.

The controller also offers built-in soft-start feature that greatly reduces the mechanical stress on the motor as well as the electro-dynamic stress on the attached cables and battery, therefore extending the life span of the whole system. When power is connected to the circuit, the duty cycle will start from 0% and go up to the preset value in about 1 to 1.5 seconds.

These units have a fully adjustable idle speed 0-100%, but are preset at our factory to 40%. The idle speed is easily adjusted onsite via the single potentiometer knob inside the control box. The fans will run at preset idle speed to 30 degrees Celsius. When the engine room reaches 30 degrees the fan speed automatically increases incrementally until 40 degrees Celsius. At or above 40 degrees Celsius the fans will run at 100% and remain at 100 % until the engine room temperature is reduced below 40 degrees.

We recommend a maximum of 4 x 12/24v DC Compact Fans per 1 controller.

Air-On-Demand Analogue - AC Version

Info about our DC AOD systems.

(Use this link for DC AOD Systems)

You will need a Licensed Electrician to install the AC systems. This system offers a fully automated control with a simple selector switch- AUTO/OFF/ MANUAL. 

The manual setting can be adjusted form 0-100%. The manual setting is utilised for maintenance periods in order to limit engine room noise. When the system is on AUTO and active, the controllers will directly vary the fan speed in direct relation to the Engine Room Temperature. This allows maximum performance at minimum power and sound levels, creating the ideal low noise work environment and allowing the best possible performance and protection of both crew and equipment. 


We stock these common sizes:

2.2Kw VSD 240v (variable speed drive)
2.2Kw VSD 3Phase (variable speed drive)

Custom size of 0.75Kw - 30Kw are available on request.


These are fully programmed and bench tested with installation schematics.

ANALOGUE AIR-ON-DEMAND - DOCUMENTS & DOWNLOADS

Installation Instructions

Spec Data Sheets

  • AC & DC Air-On-Demand Installation Instructions will be available soon.

Pricing for Analogue Air-On-Demand Units

Our AC and DC Air-On-Demand Unit Pricing

Our DC Air-On-Demand unit is currently being resourced so please get in touch for current pricing.



Please be sure to check our spec data sheet for this product to be sure it does suit your application.

Our AC Air-On-Demand unit is available in two options, 240V and 3Phase (both multi voltage)


Both the 240V and the 3Phase are customised to each solution so please get in touch for a quote.

Contact us

If you have any questions about which Air-On Demand Fan Speed Controller might be suitable for your, please contact us and we would be happy to help.

If you have any questions about which Air-On Demand Fan Speed Controller might be suitable for your purpose, please contact us and we would be happy to help.

Get In Touch

Info ABOVE this section relates to our Analogue Air On Demand Fan Speed Controllers.


Info BELOW this section relates to our Digital (Red Lion) Air On Demand Fan Speed Controllers.

Air-On-Demand  Fan Speed Controller Digital Red Lion  System

Features Of Our Air-On-Demand (DIGITAL - Red Lion System)


  • Easily change between automatic mode, manual extract mode, manual supply mode and OFF (note - we STRONGLY recommend supply air as it is far more efficient)
  • Ability to quickly adjust speed of fans manually in the engine room
  • Control screens display live data regarding engine room temperature, frequency output and power usage
  • Status of the system is visually displayed (Alarm/Warning/Running) allowing for easy identification when errors occur
  • Readouts screen shows live analog current draw, motor voltage, heat sink temperature and DC link voltage
  • Ability to perform diagnostics on system for optimisation
  • Option to be programmed into a ship management system (via Modbus Addressing)
  • Real-time data logging
  • Ability to control multiple VSD’s on a single control panel

Air-On-Demand Digital - AC Version

Info about our AC Red Lion Digital controller.

(Use this link for Analogue AOD Systems)

The Red Lion 4.3" CR1000 Human-Machine Interface (HMI) is utilised by MAFI to control the operation of all VSD's from a single panel.


The CR1000 HMI module includes a full-colour 4.3" touch-screen panel with 2 serial ports, 1 Ethernet port and an SD port. The Red Lion system provides real-time feedback on the performance of the VSDs, allowing the user to adjust the fan's speed to optimise engine room ventilation. Additionally, the Red Lion system has a sleek, modern look that is not out of place on the most luxurious of control panels. 

Red Lion Controller Screens

DIGITAL (RED LION) AIR-ON-DEMAND - DOCUMENTS & DOWNLOADS

Installation Instructions

Spec Data Sheets

  • Digital Air-On-Demand Installation Instructions will be available soon. Our User Manual is now available
  • View Spec Data Sheet

Pricing for Digital Air-On-Demand Units

Our Digital (Red Lion) AC Air-On-Demand Unit Pricing

Please consider our Analogue system if you require a DC option for a fan speed controller.


The price for our Digital Air-On-Demand systems is pending the vessel application. Expanded capabilities will result in a higher price.

Our Digital (Red Lion) Air-On-Demand unit is available AC only.


The starting price for these units is $2880 + gst.

(Typically they sit at around $3800 for most applications)

Contact us

If you have any questions about which Air-On Demand Fan Speed Controller might be suitable for your, please contact us and we would be happy to help.

If you have any questions about which Air-On Demand Fan Speed Controller might be suitable for your, please contact us and we would be happy to help.

Get In Touch
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