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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.
NOTE: For those with Model 3 fan purchased before September 2006 please see item # 3589 for the Retro Fit Rings
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