The primair fan controller is a combined fan and speed controller and thermostat. It thermostatically controls exhaust and intake fans simultaneously from 14 to 36 Deg C.

The speed dials on the unit set the idle speed that the intake exhaust fans run at to ensure adequate ventilation. The fans run at maximum speed when the temperature set point is reached, thus controlling the temperature . Supplied complete with full instructions and remote temperature probe. Just wire in the fan to the unit set your target temperature and let the primair do the work.