A simple variable speed rheostat fan controller.

The MUC controller can operate a mechanical damper, as well as the chimney fan, and includes an audible and visual alarm function.

The H100 controller is a fully automated fan speed controller that can automatically modulate the speed of the fan to maintain a slight negative pressure in the flue, to create perfect constant draft in your chimney, regardless of wind, temperature, or barometric pressure changes. This controller can also control an automatic damper and includes an alarm function.

The K150 Controller is an automated constant pressure draft controller used for domestic boiler, furnace, and water heater exhaust systems.  With the RSD draft inducers, the K150 rapidly responds to external pressure changes, to maintain a constant pressure in the exhaust system for increased efficiency and proper operation.  The K150 includes a bi-directional pressure transducer and can interlock with up to 2 appliances