Diffuser is whistling after startup
Airflow/TAB Impacts From InstallationV136 field-polished
Whistling usually points to pressure/turbulence at a diffuser, damper, tap, sharp edge, or restriction. Find the source before closing dampers blindly.
Field checklist
- Listen for exact whistle location.
- Check diffuser neck, damper position, collar, tap edge, and nearby elbow.
- Look for takeoff too close to a fitting.
- Document condition with room/device tag.
- Ask before cutting, relocating, or changing damper setting.
Ask foreman
The whistle is at [device/location]. Do you want me to check diffuser neck, damper, tap, and takeoff location before we change anything?
Do not
Do not hide noise by cranking a damper shut without finding the restriction.
Why it matters
This route was added from apprentice scenario testing to catch natural field/search language before it becomes a dead end. Verify job-specific authority before acting.
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