Ductwork Sound Attenuation Requirements

For this duct run, is a sound attenuator required? And what are the insertion loss requirements?

I'm checking ductwork sound attenuation requirements at [location]. I found large rectangular device in ductwork designed to reduce noise transmission. For this duct run, is a sound attenuator required? And what are the insertion loss requirements?

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Stop if

Hold point on ductwork sound attenuation requirements: I have the location, photo, drawing/detail, and what I checked. Who should verify before this gets cut, drilled, covered, lifted, connected, or signed off?

Watch out

Don't skip sound attenuators where shown on drawings. Don't assume standard liner is sufficient.

Check

room/grid/area
photo of condition
drawing/detail or submittal
what I already checked
what is blocking progress

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14138 ductwork sound attenuation requirements insulation, liner & condensation yellow 3 for this duct run, is a sound attenuator required? and what are the insertion loss requirements? i'm checking ductwork sound attenuation requirements at [location]. i found large rectangular device in ductwork designed to reduce noise transmission. for this duct run, is a sound attenuator required? and what are the insertion loss requirements? sound attenuator duct, acoustic ductwork, noise control hvac sound attenuator, acoustic duct, silencer, acoustic liner sound baffle, noise reducer, quiet duct, acoustic duct

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