Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
As described in the Engineering Documentation, "The exhaust fan model is similar to, but simpler than, the models used for air system fans. The electric power calculation is simplified and uses a constant overall efficiency." So the electricity usage is simply calculated as: FanPower = VolumetricFlowRate * PressureRise / TotalEfficiency.
