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AHU Fan Total <br />Pre Retrofit Operation <br />Fan Horsepower 8.0 <br />Fan Hours 5,016 <br />Avg. Fan Speed 100% <br />Fan Load Factor 100% <br />Fan Efficiency 86% <br />Average Fan Energy kW 6.94 <br />kW = HP x 0.746 x Load Factor x (% Speed)^2.5 /Efficiency  <br />(theoretical equation is speed^3, actual is closer to 2.5) <br />Fan Energy, kWh 34,808.71 <br />Post Retrofit Operation <br />Fan Horsepower 8.0 <br />Fan Hours 8,757 <br />Avg. Fan Speed 75% <br />Fan Load Factor 75% <br />Fan Efficiency 90% <br />Average Fan Energy kW 2.42 <br />Fan Energy, kWh 21,168.60 <br />Electric Savings, kWh 13,640