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Thread: duct design ?

  1. #1
    Join Date
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    duct design ?

    PD of wet coil =.27
    PD of 4" honeywell f100 merv 11 filter cabinet = .23

    my math tells me i have 0 ASP for my duct.

    WTF.

    suggestions to go from here. C width coil vs B width?

  2. #2
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    How about a MERV 8? I have found that can make a difference.
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  3. #3
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    I don't know your situation but if there's like two returns off of the return plenum then you could put two filter racks to reduce the static. Or my favorite is to use multiple return filter grills. The only problem is that usually restricts you to either one or two inch filters.

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  4. #4
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    Quote Originally Posted by R600a View Post
    I don't know your situation but if there's like two returns off of the return plenum then you could put two filter racks to reduce the static. Or my favorite is to use multiple return filter grills. The only problem is that usually restricts you to either one or two inch filters.

    Sent in a state of increasing entropy using Tapatalk
    Filter grills are restrictive be careful there

  5. #5
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    Yes but if you have multiple you can get the static pretty low by having more filter area.

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  6. #6
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    Mar 2014
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    Why not pick a less restrictive filter? I use the following budget to pick my filters, coils and size ductwork.

    Coil PD max 2.5”
    Filter PD max 1.5”
    Supply Duct .05”
    Return Duct .05”

    If I’m limited on ductwork then I’ll pick a less restrictive filter or over size the coil cabinet.


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  7. #7
    Join Date
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    Thread Starter
    Actually everyone, I just can’t read......

    Name:  IMG_3538.png
Views: 95
Size:  188.6 KB

    If I could read, I would have seen that running a 16x25 at 1200 cfm then my pd is like .175 across the filter.

    Back to the calculator......

    What a dumb dumb.


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