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  1. acdude

    choosing proper friction rate for flex duct

    thnaks i guess the .1 i have been using is the correct rate..ill use the .05 for return and see how that works.. thanks
  2. acdude

    choosing proper friction rate for flex duct

    i am using a standard trane ductulator ,hand held slide type,and have been using an 0.1/0.2 friction rate to calculate duct size. My issue is this,id like to find one rate to use as a standard for a rule of thumb type process and if its not the correct rate what is a good one to choose? I am a...

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