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  • Users: coffmarm
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  1. coffmarm

    Small OA precooling unit

    I'm looking for a manufacturer of a small outside air DX precooling unit in the 300 CFM to 600 CFM size range. I haven't been able to find anything smaller than 700 CFM. Any suggestions?
  2. coffmarm

    Flexible duct

    I've unsuccessfully searched the internet several hours for a supplier of a heavy-duty, 42" diameter, spiral-wire-reinforced, flexible duct for conveying clean ambient air at 5" WC. Does anyone know where I might find such an animal?
  3. coffmarm

    piping fluids

    I have a pressure regulator set for 140 psi supplying water to a heat exchanger with a maximum pressure rating of 150 psi. If someone rapidly closes a butterfly valve downstream of the heat exchanger, will the heat exchanger see a pressure spike in excess of 140 psi? If so, I can prevent it by...

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