A volume damper inside a round duct connects to a square shaft driven by a mitered gear assembly attached to the duct. The square shaft extends downward through a concealed remote regulator secured by a lock nut. A cover plate finishes the assembly flush against the hard ceiling.
COVER PLATE HARD CEILING LOCK NUT SQUARE SHAFT VOLUME DAMPER DUCT CONCEALED REMOTE REGULATOR MITERED GEAR ASSEMBLY ATTACHED TO DUCT
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