high velocity ac

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creger.robert
creger.robert Posts: 117
in A-C, Heat Pumps & Refrigeration

I am looking for 6" or 7" round duct insulated inside for hi velocity does anyone have any suggestions or thoughts

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  • pecmsg
    pecmsg Posts: 7,634

    high velocity system ducts are critical. # of takeoffs per ton MUST be designed properly

    PC7060
  • EBEBRATT-Ed
    EBEBRATT-Ed Posts: 21,329

    If you mean the duct is insulated on the inside like with duct liner, I have never seen round duct that way. Round metal duct insulated on the outside with fiberglass or Armaflex or Pre insulated flex duct

    PC7060
  • PC7060
    PC7060 Posts: 1,980
    https://forum.heatinghelp.com/discussion/comment/1866825#Comment_1866825

    Diameter size of plenum is specified by OEM and insulation is external. As @pecmsg said, position and spacing of takeoff must be done per manufacturer instructions as does the length of the individual runs. Typical runs are 10-15 feet with balancing attenuation disc instance at plenum takeoff based on the design flow of the line. Final 3’ of each run is the sound attenuator. Runs longer than 15’ total have significant loss of flow so design is critical.

  • creger.robert
    creger.robert Posts: 117

    I understand all that believe me. The factory is the one who instructed me to have lined inside in this application-I have installed these systems for 30 years

    PC7060
  • retiredguy
    retiredguy Posts: 1,109

    The insulation inside the duct is for noise reduction since high velocity air systems are usually noisy. I am retired and have been for quite some time but the only high velocity systems I can remember were from the pre1970's.

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