Jack Duffy

  1. Get More From Your Blower Door

    A comprehensive guide to getting the most out of your blower door system
    Authored By: Sam Myers

    A blower door system can do much more than tell you how much your building is leaking. It can also help you determine the location and severity of the leaks in different zones. There are also cases where you can use your blower door to determine if some ventilation systems are working properly. Knowing the tightness of a home and finding leaks is helpful to HERS Raters, BPI analysts, insulators and HVAC contractors. In this article we’ll introduce the blower door system and ho

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  2. United States Home Energy Performance Averages

    This image shows how a house’s natural stack effect pulls air in from the bottom and pushes it out through the top.When it comes to home energy performance, comfort, durability and health, the United States falls short in the ranks compared to other developed countries. This is based on the 35 years of experience that Colin Genge has in testing houses from coast to coast and from selling diagnostic tools to over 10,000 technicians who have tested millions more.

    Duct leakage in existing homes can range from 12% to 35%.

    Most American houses have poor quality flex duct running outside of the envelope into attics and/or crawlspaces and typically leak an average of about 20%. Some as high as 50%! Code for new

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  3. A Brief History of Retrotec’s Involvement with Home Performance

    In 1980 I calibrated the fledgling Retrotec Energy Innovations Ltd.’s blower door at the National Research Council (NRC) in Ottawa, Canada.  It used RPM and pressure drop to crudely measure flow.  Little did I know that what I learned from the head air flow scientist at NRC would result in a 38-year long career making Retrotec the largest calibrated door fan manufacturer in the World.

    Retrotec stands for retrofit technology, which means fixing houses after they’re built.  Our first blower doors were designed to perform energy audits on these houses using their in-house energy analysis software based on HOT2000.  It ran on a 32k pocket computer.   Currently known as Home Performance (HP), this application was promoted by Retro

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  4. The RESNET 380 Standard

    As you may have heard, the RESNET 380 standard will replace RESNET Ch. 8 which dictates how raters test homes for envelope leakage, duct leakage, mechanical ventilation, and duct system air flows. Any home permitted on or after July, 1 2018 must be tested in accordance to the 380 Standard. The standard currently applies to all single-family homes as well as multifamily projects that are three stories or less. There are more updates coming for multifamily so make sure you are signed up to receive email updates from RESNET.

    Definitions

    One goal of the 380 standard is to improve consistency throughout the HERS process and to reduce the need for Raters to make judgement calls when taking measurements in the field. To help achieve this, the standard includes definitions for:

    • Conditioned Space Volume
    • Unconditioned Space Volume
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  5. rCloud Releases & Updates

    Major Enhancements Are Right Around the Corner

    October Release

    • Feature 1: Completion of the ATTMA (Air Tightness Testing & Measurement Association) standard. This standard is primarily used in the United Kingdom but also used or referenced in 90 other countries. This standard has two types of test available: Single Direction Multi Point Test and Dual Direction Multi Point Test. A lot of the groundwork for ATTMA was completed in the September release (1.1.7) however due to time constraints and the size of the feature some functionality was pushed into the October release. The biggest piece of this feature to be added is to allow user input of the fan flow equation parameters received when a test fan is re-calibrated, and have these parameters be used in
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  6. rCloud

    View the latest updates for rCloud.

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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. 

    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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  8. When should I care about leakage around the door panel?

    How and when should I compensate for 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 t

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  9. Can I print my test results from rCloud in order to show my local officials?

    Yes you can print your results via the rCloud portal. Just login to the rCloud web portal, find your report and you can save your report as a PDF to be printed.

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  10. What gauges does rCloud work with?

    rCloud works with a WiFi enabled DM32 gauge only.

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