The GBL iris dampers are essential for smooth control of
the duct air pressure. The lever and the iris blade mechanism
allows changing the clear opening diameter in infinitely variable steps.
The iris-type closure allows choking the air flow without turbulence
or in-duct noise. The GBL iris damper can be installed both in air
supply and air exhaust ducts.
This product features two output ports as an interface for an air flow meter.
The GBL can be opened to the full clear diameter for easier cleaning of the ductwork.
The iris dampers, however, cannot be sealed shut (the maximum closing ratio is ca.
25% of the nominal clear diameter).
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