page 28 of 91 USB-QFLCII-14804/0
The inlet isolation device is attached on the suction side and remains
opened due to the air current during system operation. A stopper, located
on the inside of the inspection lid, limits the opening angle of the flap blade.
The maximum opening angle depends on size, (see Section 1, Technical
data). When the device is not in operation, the flap blade closes due to its
own weight. The flap blade is locked in the closed position, which avoids a
reopening due to flutter.
Flap blade stopper
Flap blade stopper
Flap
Air flow
Flap Pipe connection
System in operation (flap open) System out of operation (flap closed)
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