Residential

  1. Is using a positive duct test pressure advantageous?

    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”

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

    I am doing duct testing and use the DW/143 standard (UK).  FanTestic keeps telling me the test 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.

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  3. 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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  4. 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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  5. Should I tape over the L ranges on my 1000/2000/3000 series fan?

    The L ranges on the fan are designed to be left open unless you are using L2 or L1.

    Covering those four 1 inch holes in the center of the C8 plate will cause range C1 to read about 25% higher and C2 to read about 12% higher flow.

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  6. 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 super tight door could be as tight as 1 square inch of leakage and can even have less.

    One rule of thumb is that all standards require the blower door panel to be leakier and never tighter than the existing door.  The Modular Panel qualifies here.  It is likely that the Aluminum Frame and Cloth are tighter than the existing door.  In e

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  7. How do I know how many fans I need for a Blower Door or Enclosure Integrity Test?

    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. 

    To access them, click on the link below:

    http://retrotec.com/support/software-downloads

    Then, scoll down to the Tester Tools section and 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 gree

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  8. How do I know how many fans I need for a Blower Door or Enclosure Integrity Test?

    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:

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  9. When I try to install FanTestic or Integrity, I get the error "Cannot Start Application" and it says "Cannot continue. The application is improperly formatted. Contact the application vendor for assistance."

    Answer

    If this is the Error you are seeing:

    Click on the "Details" button to get more information.  In the summary, you will see:

    ERROR SUMMARY:  "+ Your Web browser settings do not allow you to run signed applications." 

    This error summary indicates that there are security settings in your web browser  that are preventing the application from being able to download. 

    Some people have had success by adding http://retrotec.com to their "Trusted Sites"  in the Tools>>Internet Options>>Securi

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

    500 Flow Chart

    6000 flowchart

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