Why is it bad to brace across a flexible duct connector?

Answer

A canvas/flexible connector is supposed to break vibration and allow movement. A rigid brace across it turns it back into a solid connection.

Remove the brace across the flex gap and confirm the duct side and equipment side each have their own approved restraint/support method.

Field checks

• Confirm the brace physically connects both sides of the flex connector.
• Check whether vibration is transferring across the joint.
• Verify independent seismic/vibration restraint for duct and equipment.
• Do not remove required bracing without a replacement layout.
• Coordinate with foreman/inspector if the brace was already tagged.

Ask foreman

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Why this matters

Bridging a flex connector creates vibration, noise, torn fabric, and failed isolation.

Final direction still comes from approved drawings, specs, manufacturer instructions, employer policy, foreman/detailer direction, structural/seismic details, and AHJ/code requirements.