G.A.S EC5 Fan Speed Controller - Reactive Temperature Technology for EC Fan Pairs
Best for: growers who want the fastest-reacting thermostatic control G.A.S offers for a pair of EC intake and extraction fans.
Our thoughts
This is the top of G.A.S's EC controller range for a reason - Reactive Temperature Technology means it doesn't just react to temperature, it reacts to the rate of change, so a sudden heat spike gets dealt with fast rather than the fan slowly catching up. If you're chasing tight tolerances rather than "close enough," this is the one to spend the extra on over the base EC or EC2.
The G.A.S EC5 is the flagship thermostatic fan speed controller in the Global Air Supplies EC range. It manages your intake and outtake EC fans from one unit, balancing them against each other to maintain steady negative pressure while holding your target temperature.
What separates the EC5 from the rest of the range is Reactive Temperature Technology (RTT). A built-in microchip monitors not just the current temperature but how fast it's changing - if there's a sudden spike, the EC5 reacts immediately and stabilises it quickly, rather than gradually ramping fan speed the way a standard thermostatic controller would. For small, gradual temperature drift it still ramps smoothly, avoiding unnecessary noise and fan wear. It plugs straight into any G.A.S or Hyperfan EC Fan V2 via Active Cable, so no separate power supply is needed.
How it compares
The EC5 is priced and specified as the premium option in G.A.S's own EC controller line-up.
- Versus the G.A.S EC2: the EC2 offers thermostatic control and balancing, but without RTT's faster response to sudden temperature spikes.
- Versus the base G.A.S EC controller: that model is manual speed control only, with no thermostat at all.
- Versus TrolMaster's Hydro-X range: TrolMaster offers app-connected multi-zone control at a considerably higher price point; the EC5 stays focused on doing thermostatic EC fan control well at a fraction of the cost.
You're paying more than the base EC controller for genuinely faster, smarter temperature response - not just a badge upgrade.
Usage guidance
Setup follows the same active-cable plug-and-play approach as the rest of the EC range.
Installation
Connect to your intake and outtake EC fans via their Active Cables. No mains connection to the controller is required - it draws power from the fan link.
Setting your target
Dial in your target temperature and your minimum and maximum fan speeds; the EC5's RTT will handle the rest, reacting faster to sudden swings than a standard thermostat.
Balancing intake and outtake
Use the built-in balancer to set your outtake fan slightly ahead of intake, keeping your grow space under negative pressure.
Technical specifications
- Control type: Thermostatic EC fan speed control with Reactive Temperature Technology (RTT)
- Manufacturer: Global Air Supplies (G.A.S UK)
- Power supply: Fan-powered via Active Cable - no separate PSU required
- Compatible fans: G.A.S and Hyperfan EC Fan V2 range
- Outputs: 2 (intake and outtake)
- Balancing: Built-in fan balancer for negative pressure
- Response: Rate-of-change temperature reaction, not just fixed-point thermostat
Who this is for
- Growers who've had problems with heat spikes outpacing a standard thermostatic controller
- Anyone running EC fans who wants the most responsive control G.A.S makes
- Growers who want balancing and thermostatic control in one unit without stepping up to a full environmental controller
Best suited to single-room setups where fast, accurate temperature response matters more than multi-zone or app control.
Our take
RTT is a genuine, useful step up rather than a marketing label - it changes how the controller behaves during a real heat spike, not just how it's described. For anyone who's watched a basic thermostatic controller lag behind a fast temperature rise, that's worth having.
If you want the best thermostatic control G.A.S builds for a pair of EC fans, this is it. One we sell a lot of for new growers stepping up their setup.
