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Port length for microTower
Port length for microTower
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Old 22nd June 2021, 10:19 AM   #1
DoktaDave is offline DoktaDave
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Default Port length for microTower

Hi
I'm almost certain this is a dumb question, but I can't work out what I'm doing wrong. I'm currently building a pair of the Microtowers from the frugal-phile website using the Pluvia 7HD. The port for this is specified as 3 inches diameter by 4 inches length. The pipe I have for this is 80mm internal diameter. It seems unlikely that that would make much of a difference, but to check, I've tried to re-calculate the port-length using the equation Lv=(23562.5*Dv^2*Np/(Fb^2*Vb))-(k*Dv) (as recommended in the plans). When I do it though, it tells me the port should be over a metre long. Where am I going wrong?
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Old 22nd June 2021, 11:18 AM   #2
bansuri is offline bansuri  Italy
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I think that guy mixed up inches with centimetres.
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Old 22nd June 2021, 12:00 PM   #3
Scottmoose is offline Scottmoose  United Kingdom
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For an 80mm duct diameter, increase length to 108mm assuming a regular untapered type.
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Old 22nd June 2021, 06:11 PM   #4
GM is offline GM  United States
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FYI/FWIW: Scaling vents: FE126E enclosure question
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Old 22nd June 2021, 07:28 PM   #5
DoktaDave is offline DoktaDave
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Thank you. This is exactly what I needed
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Old 23rd June 2021, 04:53 AM   #6
GM is offline GM  United States
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