BOMI Air Handling, Water Treatment & Plumbing Systems Practice Test

Where are volume dampers typically installed in a duct system?

In the main supply plenum In each branch duct At the fan inlet Inside the diffuser

Correct Answer:

In each branch duct

Explanation:

Balancing airflow across a duct system is achieved by adjusting airflow right where it splits into individual branches. Volume dampers are placed in each branch duct, at or near the branch takeoff from the main supply, so you can independently tune the flow to each zone. This location makes it possible to meet the design intent for each area without altering the entire trunk or the upstream fan performance. Placing dampers in the main supply plenum would affect the whole system uniformly and makes it hard to balance individual branches. Installing them at the fan inlet would disrupt the fan operation and pressure relationships upstream. Putting them inside the diffuser would change room discharge patterns and wouldn’t provide a means to adjust the flow to each branch.

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