GHC Multifan – Digital Fan Controller

No need for an additional Min/Max thermometer in your room, the MULTIFAN controller records this data for you. Simply press and hold the menu control dial to display these values. Re-set by holding the dial again.

Balance like never before…

The built in balancer allows you to regulate the difference between your intake and exhaust fans. This gives the ability to control ‘negative pressure’ and ‘air exchange rate’ in the grow room. Negative pressure ensures that air will only escape via the exhaust fan & filter preventing unwanted smells leaking from the room.

Achieve optimum air exchange rates by keeping intake and exhaust fan speeds close together. Maintaining the correct amount of negative pressure reduces fan workload, improves efficiency and reduces running costs!

Operate in real time with the simple on screen slider. Adjust the balancer in conjunction with the work modes to achieve an optimum airflow like never before.

This will set the lowest speed your fans will drop to, preventing fans from running excessively slow.

As the fan speed reduces, the fans will only drop as low as the ‘set minimum fan speed’.

This prevents fans hitting such a low speed that grow room air stagnates. There will always be fresh air moving through the room and replenishing CO2 etc.

Optional via the menu, but when turned on will give you the ability to set a desired humidity in the day and night settings. The Humidity Assist will pulse the current fan speed, raising it by 20% before returning to current speed. This purges damp grow room air without affecting temperature.

This feature can be used alongside humidifiers or to protect carbon filters from the effects of high humidity (giving a longer life span for your filter).

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Work Modes for every scenario…

Our vast experience using other controllers on the market led us to realise one major problem. They require the user to know the airflow of both their intake and exhaust fans.

This means calculating ducting lengths, ducting bends and filters to achieve correct airflow and maintain negative pressure. Other companies suggest having a larger exhaust fan over intake fan. This is a good starting point but can still be inaccurate and problematic.

Most fans have standard sizes (4″/ 6″/ 10″ etc) but the airflow of each can vary depending on brand. In most cases the ‘simple’ work mode will be more appropriate for regular fan set ups, where the exhaust fan is more powerful that the intake. Setting linear work modes allows for irregular fan set ups to be used. Experimenting along side the balancer allows for further fine tuning.

Our proprietary algorithms will do the work, so you don’t have to…

Set your desired temp / humidity for day time (lights on) and night time (lights off) and sit back and let the Multifan go to work! No need to set the time or fiddle with timers, the light sensor does that for you.

When transitioning between day and night mode, the software activates the cool down process. This ensures a smooth 1 hour natural transition from day temperatures to night temperatures.

Warning lights display to the user if the grow room has been out of the set parameters for longer than 30 mins. A solid red light is displayed, and can indicate problems with grow room ventilation or excessive heat, as well as sensor problems. In the case of a failed or damaged sensor, a flashing light will be displayed. In this event the Multifan has a fail-safe! (More Below)

From the day you start your controller, it is collecting data, day and night. This data is used in the case that the unit detects a sensor issue, and will select the average fan speed until the user is present and any sensor issue is resolved. This means fans will not act erratically if there is a problem with the sensor. In the event of power cut, all data is stored and retrieved on power up.

Twin A/C plugs are rated IP54 when closed, meaning low risk of damage if splashed by liquids.

This improves safety when A/C plugs are inactive. For example when using an AC intake with EC exhaust you are not left with an exposed plug, maintaining a safer grow room!

Twin E/C ports allow flawless data transfer to any E/C fan with 3-Pin cable.

The unit connects to a 3-pin data cable and works with many fans. If not compatible, adaptors are available for most fan types.

Mounting brackets included are easy to fix, and provide four fixing points to be mounted to a wall or hung in place.