What indicates acoustically lined duct on a Mechanical HVAC print?

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In HVAC drawings, acoustically lined ducts are indicated by the use of hatching on the duct. This hatching symbolizes that the duct has been treated or constructed with acoustic lining material designed to reduce sound transmission. The specific pattern or style of hatching can vary depending on the standards or conventions used in the drafting process, but its presence clearly marks the duct as acoustically lined, differentiating it from regular ductwork.

While other options may include visual elements of duct representation, they do not specifically denote acoustic lining. For instance, thick and bold lines could signify different types of duct systems but do not inherently imply acoustic treatment. In contrast, stating that all HVAC duct downstream of VAVs are always lined lacks accuracy since not every system design necessitates acoustic lining post-VAV. Lastly, shading could indicate various conditions within the duct system, but it is not a standard method used to indicate acoustically lined duct. This makes hatching the definitive choice for recognizing acoustic properties in HVAC prints.

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