TinnerFlow™3rd YearRED · Stop and get directionSloped Spiral Support / Drift
A sloped round run needs a positive anchor point. Loose loop hangers can cradle the pipe but may not stop downhill drift.
When a round duct run slopes for a long distance, its dead weight has a downhill component. Teardrop or loop hangers may let the pipe walk down the slope, especially with fan vibration.
Install an approved fixed support or saddle anchor at the proper location so the duct cannot slide into equipment, fittings, or terminal boxes. Check the load path and get direction if the run is heavy or high overhead.
Do not rely on loose loop hangers to stop a heavy sloped spiral run from sliding.
Downhill drift can crush equipment, pull joints apart, and overload supports.
Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.