Fan speed controllers

Hold the room, not the fan.

A controller sets extraction to suit the room rather than leaving a fan flat out. Environment units read temperature and humidity and adjust themselves; the simpler ones set a fixed speed on one or two fans.

Nothing matches all of those filters.

EC compatible

Speaks to an EC fan over 0-10V, so speed is set on the fan motor itself rather than by cutting its power.

SMS Hybrid Controller Pro 4A – Fan, Light & Irrigation

  • Type hybrid environmental / fan controller
  • Rated output 4 amps
  • Controls lighting, ventilation and irrigation equipment
  • Parameters temperature, humidity and timing
£260.49

SMSCom 6.5A Single Fan Speed Controller – Plug and Play

  • Maximum load 6.5A
  • Fan capacity single fan, or multiple via extension lead within...
  • Control software-regulated automatic speed based on tempe...
  • Installation plug and play, no wiring
£34.49

Mammoth S-MAX Pro EC Fan – Acoustic Grow Room Extraction

  • Sizes 150mm (6"), 200mm (8"), 250mm (10"...
  • Airflow 594 m³/h (150mm), 1,205 m³/h (200mm), 1,808 m³/h ...
  • Power 40W / 75W / 150W / 320W
  • Motor Speed 5,000 RPM / 3,800 RPM / 3,200 RPM / 3,000 RPM
£579.95

SMS Hybrid Controller Pro 8A – Fan & Light Control

  • Type hybrid environmental / fan controller
  • Rated output 8 amps
  • Controls lighting, ventilation and other equipment
  • Parameters temperature and humidity
£338.49

Phresh HyperFan EC Controller – Reactive Temperature Control

  • Control type Digital EC/thermostatic controller with Reactive ...
  • Display OLED screen
  • Minimum fan speed Adjustable 0-100% in 1% increments
  • Temperature units Celsius and Fahrenheit
£126.99

SMSCom 4.5A Twin Fan Speed Controller Mk2 – Plug and Play

  • Maximum load 4.5A
  • Configuration twin fan (intake and outtake), single-fan capable
  • Temperature accuracy +/- 1 degree of set point
  • Control software-regulated, out fan biased faster for neg...
£98.49

Environment controllers

Read temperature and humidity and drive the fans to hold a set point.

Pro-Leaf BECC-B2 Multi-Function Environmental Controller

  • Outlets 4 x 240V switched outputs (cooling, heating, humi...
  • CO2 range 400-2000ppm, adjustable deadband, fuzzy-logic con...
  • Temperature range 5-50°C, adjustable deadband
  • Humidity range 5-95% RH, adjustable deadband
£639.55

Vortex Thermostatic Fan Speed Controller – For Inline Fans

  • Product type Thermostatic fan speed controller
  • Function Switches between two fan speeds by temperature
  • Compatibility Vortex twin-speed inline fans
  • Controls Rotary temperature dial
£34.49

Vortex Twin Speed Thermostatic Fan Speed Controller

  • Product type Fan speed controller with thermostat
  • Function Adjusts fan speed based on temperature
  • Fan control Twin fan, intake and extraction
  • Controls Temperature dial and minimum speed dial
£74.49

VIVOSUN GrowHub E25 Controller – Grow Room Environment

  • Model GrowHub E25
  • Functions All-in-one scheduling and monitoring
  • Monitoring Temperature and humidity
  • Connectivity Smartphone app
£29.49

Twin fan controllers

One unit driving an intake and an extract fan together.

RAM Air Pro II 14A Twin Fan Speed Controller

  • Product type Thermostatic twin fan speed controller
  • Fans supported Two inline or exhaust fans
  • Output 7 Amps per socket (High Power)
  • Control learns and holds one stable fan speed
£117.95

Mission Control TwinFan Controller – Intake and Extraction

  • Controller type Automatic twin-fan temperature controller
  • Compatible with AC intake and extraction fans
  • Available ratings 4.5A, 7A and 14A models
  • Sensors included 3m temperature sensor (NTC) and 3m Night-Pulse li...
£94.99

Single fan controllers

One fan, one dial.

Control Freak Single Fan Speed Controller – 5 Amp

£44.49

Grow Gadgets Plug-In Fan Speed Dimmer – Single Extractor Fan

£9.49

Dimmers

Fixed speed, no sensing.

Control Freak Dynamic Frequency Fan Speed Controller

£271.95

Leads and probes

Replacement sensors, extension leads and the fittings between them.

G.A.S High Humidity Replacement Sensor – PTFE Coated Probe

£167.99

SMS Smart NTC Temperature Sensor Probe 3m (6.5A Mk2)

£15.45

Phresh HyperFan V2 Dimmer – Replacement Speed Dial

£10.45

G.A.S Y Splitter Cable (Cable Pack 3) – For EC Controllers

£12.50

The full range

VIVOSUN GrowHub E42A Controller – Smart Grow Room Automation

£87.95

G.A.S Enviro Controller – AC/EC Fan, Temp and Humidity

£298.49

Fan controllers for extraction

A fan controller takes the guesswork out of running your extractor at the right speed — instead of a fan flat out 24/7, a controller ramps it up or down to hold temperature (or humidity) automatically, which cuts noise and power draw on the days your tent doesn't need full extraction.

The SMSCom range covers single and twin-fan speed control from a simple dial; the SMS Hybrid Controller Pro (4A and 8A) adds thermostatic control that reacts to actual tent temperature. The Phresh HyperFan V2 Dimmer and EC Controller are built specifically for EC fans, and the VIVOSUN Grow Hub Controller ties fan speed into a wider environment monitoring setup.

Simple dial or smart EC?

A dial controller is the cheapest way to take a fan off full speed permanently; a thermostatic or EC controller costs more but reacts automatically as the tent heats up through the day, which matters most in summer or with a big HPS light. Pair with any extractor fan — EC fans in particular need an EC-rated controller, so check compatibility before you buy.

Express Delivery available, free over £60. Call 020 3488 0419 for help matching a controller to your fan.