A branch duct transitions from a main rectangular duct, incorporating a volume damper within the branch. A concealed ceiling damper regulator is specified for the volume damper, with a remote ceiling operator required where the damper is accessible. The branch take-off length L is defined as one-quarter of the duct width W, with a four-inch minimum requirement. Dampers must be installed at a distance of at least two duct widths away from elbows or duct intersections to ensure proper airflow.
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