# Fans & Compressors

Design Note: When we add a new fan to the FluidFlow database, we are required to assign the reference volume flow conditions for the fan performance data, i.e., STP or NTP (15°C and 101325 Pa or 0°C and 101325 Pa respectively). This data is usually available from fan manufacturers. In Figure 1, we can see that fan model Radial Blower RB75 is defined as having STP Volume Flow Conditions. Figure 1: Fan Data Entry. If we select the field titled Capacity Curve Data in Figure 1, we can access the fan performance curve at STP. Figure 2 provides an overview of the data entry for this booster. Figure 2: Fan Performance Curve If however we were to model this fan in a system transporting air at a different temperature and pressure condition to that of STP, FluidFlow will correct the fan performance curve automatically. The actual flow rate, density, etc., will then be calculated accurately based on the corrected fan performance. When you view the performance curves for the fan on the Chart tab of the Data Palette, you may notice the performance curve has been corrected/adjusted accordingly.