DM32X Connectivity Troubleshooting Guide

Unfortunately no, any kind of dye in the fluid will clog the vaporizer. It will also stain the room being smoked as the dye wont vaporize. 

If you are having issues seeing the smoke, more light in the room will help you trace it. Also remember that higher pressure differentials will increase the smoke movement. Lower pressures will slow the smoke movement down. 

Please contact [email protected] if your gauge isn't working for any other reason, as well.

We start at the highest pressure and work downward for two reasons. 

1. It helps the fans reach the target pressures faster. The speed control algorithm works faster going from a higher pressure to a lower pressure.
2. It helps you properly select your Range Ring for the test. By starting with the largest possible range (highest flow) to test at your highest pressure you ensure the minimum possible range changes while testing. Ideally, you don't want to change ranges in mid test because it wastes time. 

You need to consider that there is a fundamental issue of uncertainty with using 4 Pa as a reference pressure. Just imagine, if there is even a 1 Pa fluctuation, due to so many possible sources that can cause pressure fluctuations as you know, the pressure measurement already has an uncertainty of +/- 25% error. Consider that for almost all airtightness testing standards across the world, the reference pressure for Flow results are either 50 Pa or 75 Pa.

The main disadvantage to positive duct test pressure is that it blows off register seals or makes them leak. An LBL study showed a wide dispersion of results when the same duct test was repeated many times.  Depressurizing will allow the use of lower sticking masking materials that are less likely to pull off the paint. In some cases plastic food wrap will work.

The main advantage to positive duct test pressure is that the flex duct doesn't contract as much. In cases where the flex runs to the ceiling this contraction effect might cause problems.

Testing using depressurization will usually result in less leakage because gaps and seams will be pulled closed”

I have a Energy or Enclosure Integrity Test to perform.  How many fans do I need to properly run the test?  Do I have enough fans to run the test?

We have created two tools to help you figure out how many fans you will need for your test. 

Download either the Blower Door or Enclosure Integrity version of the Number of Fans Calculator. 

Next, open the file in excel and "Enable Editing" when a security warning appears.

Fill in all the fields highlighted in blue.  The number of fan results are highlighted in green.

Here is what the Blower Door Number of Fans Calculator looks like:

And this is what the Enclosure

You need to consider that there is a fundamental issue of uncertainty with using 4 Pa as a reference pressure. Just imagine, if there is even a 1 Pa fluctuation, due to so many possible sources that can cause pressure fluctuations as you know, the pressure measurement already has an uncertainty of +/- 25% error. Consider that for almost all airtightness testing standards across the world, the reference pressure for Flow results are either 50 Pa or 75 Pa.

How does FanTestic calculate the pressures and flows that appear in the FanTestic UI and in the generated Word reports?

The table in the report (and the onscreen data entry fields) containing data for each Set shows:

• the “Induced pressure” and this is the pressure measured by the gauge (read automatically or entered by user) without correction for bias pressure.
• the “Fan Pressure” for each Fan, and this is the pressure measured by the gauge. (read automatically or entered by user)
• the “Flow” for each Fan, which is calculated using the Fan Pressure 
• the “Total Flow” which is all the Flows added up, for all the Fans used, at that target point (will be the same as Flow if only one fan is used)
• the “Corrected Flow” which is the Total Flow adjusted as required in the chosen Standard to account for air density 
  (air density corrections generally

Uninstalling FanTestic will NOT remove any of your test files or reports, it will only uninstall the program files. 

It is generally a good practice to regularly back your test and report data to a different location.

Uninstalling FanTestic will also NOT uninstall the DM-2 USB driver.  You should still be able to see it listed as installed in your Control Panel after you restart the computer.