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• The [Channel A] Reading will be positive if there is a higher pressure on the “+“ (blue) pressure
port
2.6.2. [Channel B] Pressure Reading or Result
The [Channel B] display can show the pressure difference between the yellow pressure port “ref B” and the
green pressure port “input B”. If the pressure tubes are connected as illustrated in Retrotec’s Door Fan
Operation manual, [Channel B] shows the Fan Pressure.
• The [Channel B] pressure will be negative if there is a higher pressure on the “-“ (yellow) pressure
port
• The [Channel B] pressure will be positive if there is a higher pressure on the “+“ (green) pressure
port
The gauge can also use the pressure on Channel B to calculate and display different results for the [Channel
B] Result, such as:
• Pressure: Pa, psf or in WC
• Flow: CFM, L/s, cu m/s, cu m/h
• Flow/Area (Permeability): CFM/sq ft, CFM/100 sq ft, CFM/1000sq ft, (cu m/h)/sq m, (L/s)/sq m
• Air changes per hour: /h
• Equivalent leakage area extrapolated to 10 Pa, “EqLA10”: sq ft, sq in, sq cm
• Equivalent leakage area, “EqLA”: sq ft, sq in, sq cm
• Effective leakage area, “EfLA”: sq ft, sq in, sq cm
• Effective leakage area extrapolated to 4 Pa, “EfLA4”: sq ft, sq in, sq cm
• Equivalent leakage area per enclosure area at 10 Pa, “EqLA10/area”: sq in/sq ft, sq cm/sq m)
• Effective leakage area per enclosure area at 4 Pa, “EfLA4/area”: (sq in/sq ft, sq in/100sq ft, sq ft/sq
ft, sq cm/sq m)
The [Channel B] display is also a key: when tapped, the “Result to display” on [Channel B] will change. In
the list that shows up, tapping a [Result] to highlight it (in brighter red), will select it as the displayed
[Channel B] Result of choice. Once highlighted, the [Result] can be tapped repeatedly to cycle through all
the different units available for display of that Result.
Refer to Retrotec’s Residential & Commercial Airtightness Requirements document for Results required
according to various standards, codes, and regions.
2.6.3. Set the [Range/Device] connected to the gauge
“Device” refers to the calibrated fan or other device being used to conduct the current test in conjunction
with the gauge. It is important to make sure that the correct Device is selected because the calculation for
each of the Results is based on equations that are different for each Device.
“Range” or “Range Configurations” are the rings or plates installed on a calibrated fan to limit the air flow
through it, so that the fan can achieve a measurable Fan Pressure, even when moving only a small amount
of air (for more information, see Retrotec’s Manual-Door Fan Operation). Select the Range that matches
the Range Ring or Plate that is installed on the fan to ensure that the gauge performs accurate calculations
and displays correct results.
Retrotec calibrated fans connected to the gauge with a Speed Control Cable can have their speed of
operation controlled by the gauge through the “Fan Speed” control output.
Fans manufactured by TEC (such as the DuctBlaster or Minneapolis Model 3 or 4) can be controlled by the
gauge “Fan Speed” control output if an optional Retrotec-TEC Fan speed control Adapter is connected
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