Commercial: Variable Speed Motor (VSM) Controllers and Motors provide energy savings, quieter operation, and as much as a 3:1 turndown ratio at significantly lower costs than inverter and ECM solutions.  Maintain constant CFM regardless of chnges in downstream static pressure. 
     Fan Powered VAV Terminals  VSM-CP controller
     Fan Coil Units  
     Fan Filter Units  VSM-CP controller

Industrial: The Variable Burner Control (VBC) provides a 5:1 turndown ratio for burners allowing a full range of modulation. In addition to improved functionality, the VBC enables soft starts, low emissions, and reduced operation costs. 
     Boilers 
     Burners

Residential: The Variable Furnace Control (VFC) is a fully integrated system managing the entire combustion process, including ignition control, sequencing, and safety routines. The VFC also controls modulation of the gas valve, induced draft blower, and circulating blower. 
     Gas Furnaces