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The main distinguishing feature between the Model 3 and Model 4 fans is the shape of the flow sensor attached
to the fan motor. Model 3 fans (both 110V and 230V) use a round white plastic flow sensor, while the Model 4
fan uses a flow sensor manufactured out of stainless steel tubing.
Model 3 Fan and Flow Sensor
2.1.a Determining Fan Flow and Using the Flow Rings:
Fan pressure readings from the flow sensor are easily converted to fan flow readings by using a Flow
Conversion Table (see Appendix B), by reading flow directly from the Blower Door gauge(s), or through the
use of the TECTITE Blower Door Test Analysis Software. The Blower Door fan has 6 different flow capacity
ranges depending on the configuration of Flow Rings on the fan inlet. Table 1 below show the approximate flow
range of the Blower Door fan under each of the 6 inlet configuration. The greatest accuracy in fan flow readings
will always be achieved by installing the Flow Ring with the smallest opening area, while still providing the
necessary fan flow. Importantly, when taking Blower Door measurements, stand at least 12 inches from the side
of the fan inlet. Standing directly in front of the fan may affect the flow readings and result in erroneous
measurements.
Fan Configuration
Open (no Flow Ring)
Ring A
Ring B
Ring C
Ring D
Ring E
To install Flow Ring A, place Ring A onto the inlet side of the fan
housing and rotate the 8 fastener clips attached to the housing flange so
that they rotate over the edge of Ring A and secure it in place.
Table 1: Fan Flow Ranges
Flow Range (cfm) for
Model 3 Fan
6,100 - 2,435
2,800 -
915
1,100 -
300
330 -
85
115 -
30
45 -
11
8
Chapter 2
System Components
Model 4 Fan and Flow Sensor
Flow Range (cfm) for
Model 4 Fan
4,850 - 2,090
2,500 -
790
900 -
215
260 -
45
125 -
30
50 -
11
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