Frequently Asked Questions - Commercial Testing Application | Retrotec

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How can I improve uncertainty of test results?


Click the "Reset to Standard Default" button in the Advanced settings menu, to ensure default program parameters are used.

Why does FanTestic default to taking 10 or more readings when the Standard only requires 5?


​​Retrotec recommends you take the maximum number of test points to decrease the uncertainty in your test.

Yes, you can change this default and take only 5 readings according to the Standard but your uncertainty will often be too high and you might have to retest. Next, you might retest and find the result differs from the previous test by 10% or more making you lose confidence in the results. Retrotec defaults that include taking 10 test points and longer baselines will optimize your tests and give better results.

You might save a few minutes by testing to the minimum...

What is the flow range (in units of CFM) for the 5000/6000 fan's range configurations?


500 Flow Chart.

6000 flowchart

Can I control my DM32 over Ethernet and still plug the DM32 USB into a computer for power?


In order to do both, you need to be sure you have version 5.8.30 of FanTestic or later.

In all versions of FanTestic before version 5.8.30, if you plugged a DM32 into a computer USB to give it power (instead of plugging into the wall adapter) FanTestic would assume you also wanted to use USB Serial connection for control. FanTestic made this assumption even if the gauge was also connected to the computer over Ethernet (via the Network cable or via WiFi).

In all versions starting with 5.8.30, FanTestic discovers gauges connected via Ethernet first, so it can ignore the same...

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...

My duct test using DW/143 is not compliant, what am I doing wrong?


FanTestic checks that you have held the ducts at the test pressure for at least 900 seconds. If you do not, the test will show as not compliant. If you did a manual test and are entering the information into FanTestic, be sure to enter the time over which the test pressure was held. If this is greater than 900 and your other test conditions are correct, the test will show compliant.

Compliance means the test conditions comply with the stated requirements for a test in DW/143. Pass or fail means that the measured results are within the required level.

When should I care about leakage around the door panel?


Modular Panels are designed to be placed into doors that are not well sealed. The panel leakage for the Modular Panel is about 14 square inches compared to about 3 square inches for the Aluminum Frame and Cloth and around 1 square inch of leakage for the upgraded Aluminum Frame with snap together corners. These three panels represent three typical doorways:

  1. Poorly weather-stripped which would have an approximate 1/16 inch gap which equals about 14 square inches leakage;
  2. A well weather-stripped and adjusted door would be around 3 square inches or leakage;
  3. A
  4. ...