Retrotec Multi-Fan Blower Door - Manual (Page 18)

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©Retrotec Inc. 2015
5.3 Multiple Zones (Leaky), multiple fans per zone
Testing multiple zones can require multiple fans on each separate zone. These zones can be adjacent
rooms or separate floors.
Problem 3A: Uneven building test pressures between floors can be caused by a common set point as
shown in Figure 16. The same control signal can create uneven pressures in different zones. This
happens when one zone is leakier than the other. In this scenario all 6 fans are going the same speed.
Figure 16: Problem3A: Uneven test pressures between zones caused by Common set point control of multiple fans per zone
Target pressure: 75 Pa
75 Pa 70 Pa
Primary
Gauge