The new Hi-Velocity Pulse Width Modulation (PWM) Control is unique in the SDHV industry because it is a true “Energy Saving Zoning Control System”. The PWM controller is pressure reactive and will change the energy input to maintain constant CFM flow of open outlets from 150cfm to 1250cfm, eliminating the need for by-pass dampers. The PWM controller has three independent settings for Cooling, Heating and Recirc. Fan, allowing for fine tuning with variable commands. The PWM unit is compatible with most forced air zoning packages and has been successfully integrated with Inverter Drive Heat Pump Condensing Units, providing leading edge technology for unsurpassed comfort and energy efficiency.