Static field route #18936

What do I do when a canvas/flexible connector tears on startup?

Equipment Connections: RTU, AHU, VAV, Fans & Louvers🟨 CHECK FIRSTV189 answer-gap expansion

📖 Verified core answer

A torn flexible connector means the material, slack, pressure, weather exposure, vibration, or alignment is wrong. Shut down if needed and replace it with the approved connector material/detail.

Open in Field Rescue Open category

Field verification checklist

Shut down or secure the system before working near fan discharge if required.
Check connector material, rating, outdoor/UV exposure, pressure, temperature, and manufacturer/project requirement.
Look for no slack, misalignment, sharp edges, rubbing, vibration, or fan movement.
Inspect duct/plenum supports so the flex connector is not carrying duct weight.
Replace/repair per approved detail and recheck on startup.

Ask foreman

The flexible connector at [fan/unit] tore during startup. I checked material, slack, alignment, weather exposure, and support. Do you want it replaced with the approved connector material/detail before restart?

Text to foreman

Route options

AMake the field correction only if it is within your assignment and the approved method.

BHold and document the condition if the fix affects airflow, access, life safety, pressure class, rated assemblies, equipment, or another trade.

CBring the foreman/detailer the location, what you checked, and what decision you need before cover, startup, or rework.

Do not do this

Do not use indoor/light-duty canvas outdoors or where the project requires a different flex material.

Why this matters

A failed flex connector can dump air, transmit vibration, let water/weather in, and shut down startup.

Verification basis

Approved drawings/specs, project coordination drawings, manufacturer instructions/submittals, shop standards, foreman/detailer direction, employer policy, and AHJ/code requirements.