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FAN-PEDIA
Published by TECHNICAL DESCRIPTIONS
Twin City Fan & Blower
©2017 TCF.COM
Damper: Gravity Damper (Ceiling Type)
Ceiling Type Gravity Dampers are designed to open automatically when the fan is energized and to
close by gravity when power is turned off. These parallel blade, end pivoted dampers provide a
mechanism which prevents the air from back flowing through the system while also serving to
exclude outside elements such as rain and snow.
Damper: Manually Operated Dampers
Outlet dampers are available in both “parallel” or “opposed” blade configurations and are manually
controlled. Manual dampers are typically used to balance a system.
Damper: Motorized Dampers
Motorized Dampers are usually furnished with an actuator that powers the blades open rather than
relying on the velocity pressure of the airflow. This is of particular importance in low flow conditions
that might otherwise only partially open the automatic damper blades creating blade flutter and
potentially more noise.
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