Round Duct Applications
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(Full OPM)
1) Duct Connection
Option 1: Sheet Metal Screws
(2) #10 Sheet Metal Screws thru strap and duct walls
1" max. from radius corner of steel straps, top and bottom, typ.
(1) #10 screw at 12" O.C. thereafter
Approved Sheet Metal Screws (#10 Size):
- ITW Buildex (ESR-1976 & ESR 3223)
- Simpson Strong-Tie (ESR-3006)
- Darts (ER-5202)
- Elco (ESR-3294)
- Hilti (ESR-2196)
Option 2: Weld
Only for Duct 18 ga. and thicker
Start from strap edge
Fillet field weld, both sides
1" long every 12" O.C., typ
2) Brace Member
Maximum Horizontal FP Force (lbs) [ASD] at 45° from Horizontal
Notes:
1. Values in this table apply only to Unistrut brand products. Unistrut channels are stamped with the name "UNISTRUT".
2. Values in this table are valid with all solid, T, WT and HS pierced channels of the above channel profiles.
3. These brace members are valid for angles from 0° to 60° from horizontal. Refer to product or OPM pages for capacities.
3) Brace Fitting
FP Load Capacity (lbs)
Notes:
- Use with P3860 base.
- Use with LS 100 base.
- Use with LS 200 base.
- All angles above are from horizontal. All loads are based on use with a 1/2" or larger fastener and connected per one of the connection details outlined below.
4) Connection Details
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Brace Bolted to Channel
3" Min. End Distance
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Brace Bolted to Channel
Flush to End
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Brace Around Rod to Channel
3" Min. End Distance
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Brace Around Rod to Channel
Flush to End
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Brace Around Rod Thru Channel
1-1/2" Min. End Distance
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5) Rod Stiffeners
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