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  • Users: McCue
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  1. McCue

    How big should a hydrophobic vent opening be for outdoor application

    I've got a water tight (IP-68) plastic communications device with an internal volume of about 50 in^3. It is vented through a hydrophobic membrane for two reasons. The first is to prevent pressure build up due to changes in temperature. The second is to allow humidity fluctuations to happen...
  2. McCue

    Looking for a good reference for truss / frame design

    I'm beginning a design of a large (20' x 10' x 5') frame composed of welded box tubing. I'm wondering if anyone can recommend a good reference for design practices for this type of project. I'm looking for information on structural analysis of the frame members and more specifically the welded...
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