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  1. #53
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    Quote Originally Posted by IBEC View Post
    there are new options out the to overcome restrictive duct work.
    such as?

  2. #54
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    Sep 2007
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    State College, PA
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    Thread Starter
    Quote Originally Posted by IBEC View Post
    there are new options out the to overcome restrictive duct work.
    Yes, I would like to know that, too.
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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  3. #55
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    im waiting on a SPAM link...

  4. #56
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    Apr 2018
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    Restricted airflow.

    No. No spam link. I don’t want to get kicked off of the forum for being accused of advertising. I was on here to see how many threads were related to restricted air.

    My background is in airflow technology, problem solving. Designs of duct and re-designs of duct.

    70% of existing ductwork is installed wrong.

    For years I have been hired by engineering firms doing performance contracting related to static pressure losses. Problematic ductwork.
    High friction. Unbalanced systems.

    You could retro fit in a different blower called DECStar. Look it up online. 2.5 “ w.c. and will prob use less energy.

  5. #57
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    Feb 2016
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    Louisburg Kansas
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    He needs to find the source of the problem/s before attempting to overpower the system. The last supply duct static pressure he posted strongly indicates at least one major constriction. A discharge static of 1.5" on a residential unit is almost impossible. I doubt a fan change would do much good but if it did the noise would be too high.
    It might be helpful if you posted a fan curve for the max size DECStar that would fit this unit. He could very well need more than one solution for this problem. The noise rating for the fan would be good to know also.

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  7. #58
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    Dec 2004
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    Chicago area
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    Also,

    2.5” duct pressure in residential, might collapse the return, or blow apart the supply duct, particularly flex duct and duct board.

    Most residential ductwork if metal is only 26 gauge. 24 gauge at most.


    Sent from my iPhone using Tapatalk

  8. Likes DavidDeBord liked this post.
  9. #59
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    I can hit 1.5, 1.7, 2.0 w.c. all the time if need be. Starts to use a bunch more energy but if it solves comfort level issues without tearing out ductwork it’s worth it.
    email me: Sorry, your email address belongs in your profile, not in post.

    I can send you photos of the blower design / dimensions and fan curves.
    Last edited by beenthere; 05-05-2018 at 04:07 PM.

  10. #60
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    Apr 2018
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    Right. Don’t want to blow anything apart.

  11. #61
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    Aug 2009
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    Quote Originally Posted by joemach View Post
    I am coming to the conclusion that the reason that the basement is not happy, is not that there is limited airflow to the basement, but that there is limit air flow everywhere. The basement just not have enough supplies to satisfy it. 1750 sq. ft. & 6-6" supply registers is just not enough.

    I think the 1.5" w/c coming off the supply plenum tells that story. But I have been wrong before.
    Sorry I missed something. In the first part of this thread you had low static and it was determined that you took the static readings in the wrong place. I have not seen any other readings and all of a sudden it's 1.5". This sounds line a restricted coil or filter or both. What were the actual SA/RA readings. Did you take readings all the way through like in the RA trunk, before the filter, after the filter, before the coil, after the coil, in the SA trunk. This will tell you where your loss is. Duct fittings near the equipment can make a huge difference IF there are no restrictions.

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  13. #62
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    Jan 2004
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    Email addresses belong in your profile, not in pot. Your email address has been removed from your post.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  14. #63
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    Mar 2013
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    brute force is not fixing the problem.

  15. #64
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    Dec 2004
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    Chicago area
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    Was there a post with the actual static pressures?

    Regardless - which ever pressure was a greater integer is the direction of the main issue.

    Meaning for example:

    If the supply static before the coil was .7

    And the return on the blower side of the filter is -.3

    Then the bigger issue is on the supply side.

    If its reversed, the bigger issue is on the return side.





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  17. #65
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    Apr 2018
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    It’s not brute force. If it needs slightly higher static pressure and more cfm a blower technology change-out might be a turn key solution. I’ve done it a bunch in office buildings. Better than taking down drop ceilings and ductwork.

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