+A **duct** is a channel or conduit designed to carry a substance, often air, fluid, or cables. These hidden pathways are crucial for systems like [Ventilation](/wiki/ventilation) and controlled [Airflow](/wiki/airflow), directing movement where needed.
+## See also
+- [Conduit](/wiki/conduit)
+- [HVAC](/wiki/hvac)
+- [Plumbing](/wiki/plumbing)
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