Apprentice question
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Teardrop loops may not control large round duct under dynamic load. Upgrade to an approved rigid saddle, split ring, or trapeze cradle.
['A loose strap loop can support dead weight but still let the pipe kick, dimple, or twist when fan pressure changes.', 'Inspect the barrel where the strap bears. If the wall is dimpling, unload the run and change the support method so the load spreads around the pipe instead of cutting or squeezing one strip.']