An opposed blade damper is installed in the branch duct according to specifications. The branch connection enters the main duct at a 45-degree angle with a minimum length dimension equal to one-quarter of the width, with a four-inch minimum. A concealed ceiling damper regulator is provided for the assembly. Airflow directions are indicated along the duct runs.
OPPOSED BLADE DAMPER AS PER SPECIFICATIONS L = 1/4 W (4" MIN.) AIR FLOW CEILING DAMPER REGULATOR PROVIDE CONCEALED 45° W L NOTE: 3
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