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Understanding Filters and How Filter Restriction Monitoring Works

Why hasn't the Filter Minder® Indicator moved?

Air Filter Restriction Readins

The Filter Minder® reads the restriction in the air induction system. Air filters usually have low restriction for most of their service life, and the position indicator will not move very much. Then, as the air filter reaches the end of available service life, filter restriction increases rapidly, and the position indicator of the service indicator will move faster towards the red zone.

The chart (left) illustrates typical air filter restriction readings.