Jack Duffy

  1. Why is the positive peak pressure for FM200 zero or negative?

    How can the positive peak pressure be calculated as a negative number or zero when there is a value provided for the leakage area required for venting?

    The calculation of peak pressures depends on a curve, and when the circumstances are particular, the peak pressures can be very close to zero.  The curve is not optimized in this area, as peak pressures near zero are not a worry.  Integrity makes the value of peak pressure zero when the calculated value using the curve goes below zero, as at this point it does not matter how small the pressure really is.

    Previous versions of the software variously showed the positive peak pressure as negative or as a blank instead of a zero. 

    - blanks instead of zeros in report are fixed in Integrity versions >5.7.7.24
    - peak pressures showing negative instead of zero in the UI fixed in Integrity versions >5.7.7.24

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  2. How can I get rid of the warning about envelope area in FanTestic Integrity?

    When calculating hold time using FanTestic Integrity software, I am getting an error which says "Envelope area not specified. Unable to determine permeability result." but there is no place to enter envelope area.  How can I get rid of this warning?

    If you are seeing the following error:

    you can prevent it from coming up by modifying your settings.xml file.

    You can find your settings.xml file in your MyDocuments/Retrotec/AppData directory.  Open it using Notepad (you can right-click on the filename and choose "Open with" and then click on "Notepad").

    If you are using one of the NFPA standards, add the following text to the file:  <Setting Name="NFPAPermeabilityRefPa">0</Setting>

    When you are done it should look like:

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  3. Can I install FanTestic on a Windows 8 computer?

    FanTestic will install properly on a Windows 8 computer, as long as it is full Windows 8 and not one of the tablet or phone versions of Windows 8. 

    Make sure to disable anti-virus while doing the download and install. 

    Be sure to “Run” the installer from the internet using Internet Explorer browser, do not download it to the computer and then run it.

    If you have trouble installing FanTestic, you can first install the DM32 USB Driver directly from the website (the version on the website has an up to date certificate) and then run the FanTestic installer. 

    (Older versions of the FanTestic installer had a DM32 USB Driver which did not have an up to date security certificate so some settings on Windows 8 could cause it to reject the installation. )

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  4. Where do I place the exterior pressure pickup tubes?

    The exterior pressure reference for the differential pressure measurement across the door panel is provided by the red tube.  The exterior pickup location must be chosen to minimize the influence of wind, sun and atmospheric pressure on the differential measurement, or measurements must be taken to allow correction for these influences.  Each standard defines what is expected in terms of the exterior reference pressure measurement.  Use Table 2 to determine where best to locate your red tube depending on the standard procedure you are following.

    Table 2:  Locations for Exterior Reference Pressure Pickup as required by the various Standard Procedures

    Exterior pressure pick-up locations from Standards
    ASTM 1 tube across the middle of each façade (NOT at corners o
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  5. FanTestic could not recover the USB connection to my DM32 gauge. How do I fix this?

    1. If using a USB connection, and FanTestic advises you to unplug and re-plug the USB, you must re-plug into a Different USB port.

    2. If you are using USB connection from your computer to the gauge, we recommend that you try the Ethernet connection.  Instructions for directly connecting the blue Ethernet cable from your computer to the gauge are provided on the last page of the DM32 QuickGuide.  Follow the instructions for connecting to a switch using a "Static" connection. https://retrotec.com/pub/media/mageworx/downloads/attachment/file/q/u/quickguide_for_dm32_gauge.pdf 

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  6. How do I determine overpressure during a clean agent discharge?

    The leakage rate IS important because there is a direct correlation between leakage area and peak pressure.  If the leakage is small enough, every room will face destruction upon discharge. The reality is that most rooms are so leaky that the opposite is a problem. The agent typically leaks out so quickly that the enclosure doesn't pass the hold time requirements which means there is very little peak pressure which is why many systems do not require venting. For most FM200 systems there is a leakage range where the enclosure is tight enough to maintain sufficient hold time but not leaky enough to require vents. You'll only know if you're in that zone by performing a door fan test according to Annex C of NFPA 2001. ISO has a near identical Annex E.

    Both Standards require a peak pressure evaluation to determine whether or not the enclosure will be damaged upon discharge. Unfortunately neither standard provides the peak pressure formula. Traditionally, manufacturers of ine

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  7. Should I be concerned with air leakage into an attached garage?

    The big issue is exhaust getting into the house. Duct leaks from the supply side cause the house to have a negative pressure, which can cause air to get pulled in from the garage. Exhaust entering the home can be dangerous and can lead to health issues.

    The first step is to find what the maximum house depressurization would be with combinations of the airhandler on, closed bedroom doors, and any exhaust fans running. Do what you can to eliminate these pressures. Check to make sure there aren't any air intakes (returns) inside the garage.

    To determine how leaky the garage to house connection is test the house leakage at 50 Pa, then pressurize the garage to 50 Pa; if you see any drop in flow, there's a connection between the two.

    Next, depressurize the house and use a smoke puffer to test the garage to house connection. Seal everything between these two zones. 

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  8. Test data appears in red font. What does this mean?

    There are two cases when you will see red test data in FanTestic:

    1. Fan Pressure (flow pressure) is too low for the Range, which means you should change to a smaller, more restrictive, Range – During an Automatic test, the software would prompt you to change the Range in this case.
    2. During data collection, there was a data point collected as zero - This is caused by an instantaneous Fan pressure dropout, and the software displays this result in red to indicate data may have been skewed and should be retaken.

    If you did not receive a prompt to change Range, most likely the problem is #2. In this case, you should just click the "Clear point" button to clear that specific data point and you can re-input data back into that specific point using Semi-Automatic mode via the "Begin Semi-Automatic" button.

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  9. My computer cannot connect to the DM-2. How do I fix this?

    1. Make sure you have the DM-2 USB driver for the operating system version that matches the one on your computer (32bit or 64bit) installed on your computer.  You can see it listed in the Control Panel.
    2. Run the DM-2 Checker software that was installed with the USB driver.  There will be a shortcut to it in your Start menu of programs: 

      The DM2 Checker will open a window on your desktop, and continuously show the connection information about the DM-2 connected to your computer.
    3. Sometimes you will have to Right click on the DM2 Checker and “Run as Administrator” in order to get the DM2 Checker to run and find the gauges.  If you have to do this to run the DM2Checker, then you will have to carry out the "Run as
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  10. I am having problems with FanTestic Integrity software, how do I get help?

    FanTestic Integrity software  calculates hold time calculation for Enclosure Integrity for users in the fire suppression market.

    Please detail the specific sequence of steps that led you to arrive at the problems, as we cannot offer you a solution or fix them if we cannot understand how to reproduce them.

    Did you receive an error message? If so, what did it say? If you can reproduce the error message, please copy the error message details and reply with these details.

    This PDF gives details on what information is needed for us to be able to diagnose your problem, and where to find the information on your computer.

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