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A 2-way mouthpiece with valves was connected to the venturi, thus allowing the subject to inhale ambient air and to exhale into the venturi .
For the Demon, engineers developed a patented, contoured air entry that directed incoming air into the venturi bores with minimal turbulence.
When the pressure in the venturi is lower than the atmospheric pressure, the gasoline in the float bowl enters the airstream going into the engine.
The carburetor, throttle plate and venturi are examined.
These factors predispose to collapse, enhanced by airflow venturi effect, hence resulting in OSA.
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