High ratio of pleating

This means that a large ratio is desirable between the air stream and the filter-media area exposed to the face area of the filter element. This ratio also requires reducing the media area that is covered by separators and therefore is not exposed to the air stream. New pleating technologies allow for elimination of separators. These design advancements reduce pressure drop, provide more even airflow, and expose all media surface area to the airflow. [Robinson, 1999]

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