This measure is the purchase of an efficient commercial or industrial efficient standalone fan, it does not cover embedded fans. Applicable fan types include: axial cylindrical housed, inline and mixed flow, panel, radial, centrifugal housed, centrifugal unhoused and power roof ventilator fans. Savings are dependent on fan type, drive type, speed control, and the fan system’s FEI and FEP rating. This measure is considered planning as there are a number of key areas of uncertainty. There remain questions around, how fans are sized for actual loads, the operating hours of fans, the variability of loads etc.