Repurposed fanReplaced fan(poorly configured)(reduced system effects)BI 245Original performance10,000 cfm, 10 in. wgη = 67 %BI 245BI 300RepurposedCurrent performance20 000 cfm, 10 in. wg.20 000 cfm, 10 in. wgη = 56 %η = 80 %Figure 40 — Fan replacement of a poorly configured