Rebel's condenser fan blade design moves as much air as a traditional stamped blade at only 66% of the speed, offering the most advanced head pressure control on the market. Combine this with an EC motor, and incredibly high efficiencies are possible.
In addition, a control algorithm modulates the fan speed down to maintain a 20°F delta above the ambient air temperature in order to reduce energy consumption and maintain optimal head pressure. This leads to maximum efficiency at part load conditions.