• Inertia Dampers:

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CASTLE  Manufactured Pressure Relief Damper or Non- return damper or gravity-operated
damper, counterbalancing damper, Self-balancing or Backdraft damper.
These dampers open or close for intake or discharge or pressure relief vents in central
HVAC applications, As the room pressure increases, the blades of the pressure relief damper
automatically open by relieving the excess pressure in the room and when pressure drops back to
normal blades close by gravity or counterweight or spring.

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