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Chapter 2
System Components
This Manual includes operating instructions for the following models of Minneapolis Blower Door:
•
Model 3/110V System
•
Model 3/230 System
•
Model 4/230V System (CE labeled fan and
controller)
Both the Model 3 and Model 4 Minneapolis Blower Door
systems are comprised of three separate components:
1.
Blower Door Fan
2.
Accessory Case with Test Instrumentation (building
pressure and fan flow gauges), Fan Speed Controller and
Nylon Door Panel
3.
The Adjustable Aluminum Door Frame
While the Blower Door fan motor, flow sensor and speed controller vary slightly between the three different
Minneapolis Blower Door systems, the other system components are identical.
PC based test analysis software (TECTITE™) is also available to help you document and analyze Blower Door
test results.
2.1 Blower Door Fan
The Blower Door fan consists of a molded fan housing with a 3/4 h.p. permanent split capacitor AC motor. Air
flow through the fan is determined by measuring the pressure at the flow sensor which is attached to the end of
the motor. When the fan is operating, air is pulled into the inlet side of the fan and exits through the exhaust side
(a metal fan guard is bolted to the exhaust side of the fan).
The Blower Door fan can accurately measure airflow over a wide range of flow rates using a series of calibrated
Flow Rings which are attached to the inlet of the fan. The standard Minneapolis Blower Door system comes
with 2 Flow Rings (A and B) capable of measuring flows as low as 300 Cubic Feet per Minute (cfm). Optional
Rings C, D and E are available which allows flow measurements as low as 85, 30 and 11 cfm respectively.
Model 3 Fan with Rings A and B
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Chapter 2
System Components
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