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  1. #1
    Join Date
    May 2002
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    9,564
    Anyone have a K factor chart for VCW boxes?

  2. #2
    Join Date
    Nov 2003
    Location
    Boston
    Posts
    600
    I have a list of Flow Coefficients from a Siemens manual that lists a Trane box as 0.66.
    It does not list model numbers and I don't know how old the list is.
    Hope that helped.

  3. #3
    Join Date
    May 2002
    Location
    Baton Rouge, Louisiana
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    3,877
    Sys is this the older boxes or the newer ones?

    I have a IOM manual on these model boxes in Pdf form and at the beginning it says for air balancing instructions see
    EA10_IOM2-E, the manual I have doesnt have the K factor but the one I just listed should.
    Quote Originally Posted by MatrixTransform View Post
    very soon it is you that will be pwned

  4. #4
    Join Date
    Mar 2003
    Location
    Washington,NJ
    Posts
    504
    If you know the inlet size of the box, regardless of manufacturer, the number will be the same. A 10" box is a 10" box, ask any balancer.

  5. #5
    Join Date
    May 2002
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    9,564
    ...you know you say that and they all end up being a little different. What's the reason is what I want to really know.

  6. #6
    Join Date
    Mar 2003
    Location
    Washington,NJ
    Posts
    504
    Even if they are the slightest bit different, your balancer should give you the proper multiplier to compensate for that, but I know what your talkin about!! I'll check my online info for the Trane VCW box and get you the correct info, hey man, don't you ever sleep? Bacnet rules!!

  7. #7
    Join Date
    May 2002
    Posts
    9,564
    ... too busy fighting the ASHRAE BACnetter propaganda...

    if somebody would send over a cape I'd be set.

  8. #8
    Join Date
    May 2002
    Location
    Baton Rouge, Louisiana
    Posts
    3,877
    Sys, see my post above, that should be the manual you need
    Quote Originally Posted by MatrixTransform View Post
    very soon it is you that will be pwned

  9. #9
    Join Date
    Sep 2002
    Location
    Hampton Roads, Virginia
    Posts
    1,600
    Originally posted by sysint
    ... too busy fighting the ASHRAE BACnetter propaganda...

    if somebody would send over a cape I'd be set.
    Keep up the good fight, we need you!
    "Profit is not the legitimate purpose of business. The legitimate purpose of business is to provide a product or service that people need and do it so well that it's profitable."

    James Rouse

  10. #10
    Join Date
    Aug 2003
    Posts
    422

    Sometimes K factors are....

    ....the amount of CFM a box will deliver at 1 inch of differentialpressure.

  11. #11
    Join Date
    Apr 2007
    Location
    San Diego, CA
    Posts
    1,327
    reviving this thread... I was looking for the same thing, found this IOM dated June 2006. See page 32 for an updated pressure differential vs cfm flow chart with actual box sizes.
    http://www.trane.com/Commercial/Uplo...av_unitiom.pdf

  12. #12
    Join Date
    Sep 2006
    Location
    Alaska
    Posts
    459

    Trane K Factors

    Duct Size Area K Factor
    5 .14 3.27
    6 .20 2.65
    8 .35 2.44
    10 .55 2.30
    12 .79 2.30
    14 1.07 2.30
    16 1.40 2.27

    This is the chart I have for Trane, hope it helps!!!!
    Law Of The Thermostat: He who has the thermostat wins!!!!!

  13. #13
    Join Date
    Apr 2007
    Location
    San Diego, CA
    Posts
    1,327
    HW spudders ask for the k-factors as box CFM @ 1 in w.c.

    What's the conversion from your method?

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