TinnerFlow
Traditional Hangers & Supports ยท Supports & Hangers

Spring-isolated duct support

Near fan/equipment

ConnectionSupport method only
SupportSpring hanger/isolator

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 spring model, load range, installed height, preload, travel, orientation, vibration-isolation intent, seismic restraint, and flexible-connector detail.
  • Verify actual supported weight and center of gravity.
  • Inspect springs, housings, rods, snubbers, and adjustment hardware.

Tools and materials

Approved spring hanger or isolator, threaded rods or frame hardware, specified preload or height data, level, tape, lift, wrenches, flexible connector where shown, seismic restraint or snubber components, and manufacturer instructions.

Lay it out

  1. Locate isolation supports from the approved vibration-control layout.
  2. Keep rigid connections from bypassing the isolator.
  3. Coordinate flexible connectors, electrical bonding, and seismic restraints.

Set and support it

  1. Install the spring in the approved orientation.
  2. Set approximate preload or installed height before loading.
  3. Support the duct or equipment connection temporarily during adjustment.

Make the connection

  1. 1

    Verify spring model and load range.

  2. 2

    Connect the spring to the approved structure and support member.

  3. 3

    Load the spring gradually.

  4. 4

    Adjust to the specified installed height or preload.

  5. 5

    Level the duct without bottoming or unloading the spring.

  6. 6

    Install flexible connector and seismic restraint where shown.

  7. 7

    Remove temporary support and verify available travel.

Check the install

  • The spring operates within its approved load range.
  • It is not bottomed out or fully unloaded.
  • No rigid bypass path defeats the isolation.
  • Required travel and clearance remain.
  • Seismic restraint and flexible connection are installed as detailed.

Common mistakes

  • Selecting a spring by physical size instead of load range.
  • Adjusting until the spring bottoms out.
  • Installing a rigid brace across the isolated connection.
  • Omitting the required seismic restraint.

Stop and ask

Stop if spring range, preload, installed height, supported weight, travel, flexible connector, or seismic restraint is unknown.