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Apprentice answer

Do duct silencers and sound attenuators have airflow direction

2nd YearAirflow, TAB, Startup & TestingCheck first

Many sound attenuators are directional. Match the airflow arrow/submittal orientation before final connection so the baffles do not create extra pressure drop or noise.

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Plain-English answer

A sound attenuator can look symmetrical from the outside but still have a required airflow direction because of the internal baffle shape.

Check the airflow arrow, tag, submittal, and branch direction. If it is reversed, hold final connection, support it safely, and rotate or reinstall it before startup/TAB. Do not assume it is fine because both flanges bolt up.

Ask Foreman

The sound attenuator at [location] appears reversed compared with the airflow arrow. I checked the duct direction and tag. Do you want it dropped and spun before final connection?

Verify before acting

Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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