Do I need to internally line the first 10 feet of duct leaving the VAV box?

Yes, if specified by the engineer. This is standard practice in commercial design to deaden the acoustic air velocity noise and the metallic sound of the VAV damper blades opening and closing before the air reaches the occupied office spaces.

[' Yes, if specified by the engineer. This is standard practice in commercial design to deaden the acoustic air velocity noise and the metallic sound of the VAV damper blades opening and closing before the air reaches the occupied office spaces.']

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

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Yes, if specified by the engineer. This is standard practice in commercial design to deaden the acoustic air velocity noise and the metallic sound of the VAV damper blades opening and...

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do i need to internally line the first 10 feet of duct leaving the vav box?

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