Lesson 1/Learning Event 1
FIGURE 5. WET-TYPE AIR FILTER.
The wet type is usually called an oil bath air cleaner. Air enters the filter at the top outer edges and flows
around the sides over a bath of oil. The airflow then reverses direction and moves up through the filter
element and to the carburetor. Heavier dust particles are separated from the air as the air passes the oil bath.
As the air suddenly changes its direction of movement from down to up, the heavier dust particles continue
to move down and are trapped in the oil. Lighter particles are trapped in the metal-gauze filter element. As
the airflow reverses its direction above the oil reservoir, it picks up an oil mist from the oil bath to keep the
filter element soaked.
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