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Check our reviews at Trustpilot.com: 4.6

It is used in combination with an exhaust and supply fan or with only one exhaust fan.
The minimum speed controller keeps the room temperature constant and prevents the speed from falling below the set minimum.
It is easy to control, you can set the temperature and the minimum speed with just two knobs.
The controller is a high quality, complete product ready for immediate use.
Technical specification of the controller:
Voltage / frequency: 230 V / 50 Hz
Cover dimensions: 130 x 80 x 70 mm
Device dimensions: 160 x 100 x 90 mm
Designed for: 1 x 200 W / TRIAC 1 x 1A
5V digital sensor range: - 55 ° C to + 125 ° C (–67 ° F to + 257 ° F)
Sensor accuracy: 0.5 ° C in the temperature range -10 ° C to + 85 ° C
Safety class: IP54