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  1. #1
    Join Date
    Mar 2017
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    Blower door test equipment

    We are starting to get into more townships where they require a duct pressure test for duct work in unconditioned space. I only found 2 companies that make these machines. I was wondering which machine is preferred and why? Thanks for responding.

  2. Likes lkapigian liked this post
  3. #2
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
    Posts
    810
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    Duct leak test equipment is not the same as blower door equipment. United McGill is well recognized for duct leak test equipment but there are others. Duct leak test equipment is not cheap and you will probably need more than one size blower setup. Make sure you have a copy of the SMACNA duct leakage test manual.

  4. #3
    Join Date
    Mar 2017
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    Thread Starter
    We have used a Minneapolis duct blaster machine to perform these test in the past. i looked up the company you referenced and that machine definitely looks expensive. The two companies i have researched was Minneapolis and Retrotec. I will look into getting a copy of the SMACNA manual. Thank you for your feedback.

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  6. #4
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
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    810
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    The SMACNA manual is a must. Use the duct area method for determining allowable leakage unless the engineer insists on percent leakage method which is bogus. Most engineers spec leakage in accordance with SMACNA but sometimes (rarely) get it wrong. Knowing the proper SMACNA procedures allows you to get with the engineer to agree on a good test. Until the sheet metal people you are working with experience how much ducts can leak be prepared to retest for leakage. I have even had them claim I used the wrong blower. Don't use an oversized blower because you could easily blow the duct apart. There are no real secrets and SMACNA has it covered.

  7. #5
    Join Date
    Mar 2017
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    Thread Starter
    Thank you very much for your advice. I really appreciate it.

  8. #6
    Join Date
    Aug 2013
    Location
    Visalia California 93291
    Posts
    6,921
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    We are in the Minneapolis camp as well Duct Blaster and Blower Door---

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