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  Acess Door   Round Volume Damper
  Back Draft Damper   Sound Attenuator
  Duct   Volume Damper
  Plenum Box   Fire Damper

Back Draft Damper
Back draft damper is a vertical or horizontal mounted back draft damper that is designed to allow vertical or horizontal airflow and prevent reverse airflow. Frame is by Galvanized G90 thickness 1.25mm. Blade from aluminum sheet thickness 0.5mm.
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