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  1. dallas

    Dual Duct System

    We have a dual duct HVAC system in our plant. A problem we are having is that one of the mixing boxes is not "mixing" the air. The ductwork is configuered in a way in which it branches right after it leaves the mixing box. What we beleive is happening is that cold air is shooting...
  2. dallas

    Duct support

    How can one support air duct about 15 ft. down from the roof. Will trapeze type supports work or is the distance too great? The duct will run above existing lay-in ceiling. Any recommendations? Thanks
  3. dallas

    natural gas requirement for 3 ton RTU

    Thanks for your help. So i see I need a gas regulator to handle 8 psi supply line pressure and 3.5 W.C. outlet pressure. Do need a flow regulator as well or will the unit handle that function.
  4. dallas

    Natural gas pipe selection

    Could someone please tell me if this is correct: Appliance BTUh = 72000 Natural gas BTU/CF= 1025 72000/1025= 70.2 CF/hr at 8 psi inlet pressure Pipe size of 1 inch is fine correct.
  5. dallas

    natural gas requirement for 3 ton RTU

    What is the typical natural gas flow rate required for a 3 ton rooftop unit. Do these units usually have the capability of regulating flow (not pressure) on their own or does one need to supply a flow regulator
  6. dallas

    high strength bolts

    Im looking at using A325M high strength bolts. My question is, do different steel react with one another in a defective manner. For example one type for the beams and one for the bolts. Also is it standard practice to bolt beams together at the flange. Thanks
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