TinnerFlow
Traditional Hangers & Supports ยท Supports & Hangers

Unistrut rack with multiple ducts

Shared corridor rack

ConnectionSupport method only
SupportMulti-tier strut rack

Before you start

  • Confirm the approved support detail, actual duct weight, support spacing, attachment substrate, hardware size, corrosion protection, and any insulation, seismic, vibration, or rooftop requirements before installation.
  • Confirm the engineered or approved rack layout, total combined load, tier spacing, service order, brace requirements, and attachment points.
  • Verify who owns the rack design and whether future services are included.
  • Inspect all rods, channels, fittings, anchors, and braces.

Tools and materials

Approved strut-rack components, threaded rods, anchors, fittings, braces, clamps or retainers, labels, level or laser, lift, installation tools, and isolation materials.

Lay it out

  1. Lay out every tier, service, access zone, and maintenance clearance.
  2. Place large or heavy ducts where the approved design shows them.
  3. Coordinate rack width and braces with structure and neighboring trades.

Set and support it

  1. Install the full rack frame before loading services.
  2. Level and square each tier.
  3. Complete required bracing before the rack is fully loaded.

Make the connection

  1. 1

    Verify the approved component list and rack dimensions.

  2. 2

    Install anchors, rods, and primary channels.

  3. 3

    Install tiers and braces in the specified sequence.

  4. 4

    Inspect and lock the empty rack.

  5. 5

    Load the largest or heaviest ducts in the approved order.

  6. 6

    Add clamps, retainers, separators, and labels.

  7. 7

    Recheck level, deflection, and access after full loading.

Check the install

  • The rack matches the approved layout and total load.
  • Channels remain level and deflection is acceptable.
  • Each duct is supported and restrained as required.
  • Access to dampers, valves, and service points remains open.
  • No unapproved future service has been added.

Common mistakes

  • Field-designing the rack from whatever strut is available.
  • Adding one more service after the rack is loaded.
  • Blocking access with a brace or tier.
  • Loading one side first and twisting the frame.

Stop and ask

Stop if the rack is being field-designed without approved load review, or if total load, bracing, attachment, or service arrangement is unclear.