The Prima Controller - combined fan speed controller and thermostat which controls exhaust and intake fans. This can be wired to fans, program your requirements and it will do the rest. The Prima Controller has three analogue dials:

• one dial sets the best temperature for the controller to maintain
• one dial sets the minimum airflow for the inlet fan
• one dial sets the minimum airflow for the outlet fan

This ensures continuous air flow, regardless of temperature differences.