The indicator is easy to read. As the air
filter plugs, and restriction increases, the yellow position
indicator moves in the clear window and locks at several points.
When it reaches and locks in the red zone, the air filter
should be changed and the indicator reset to zero. Reset the
indicator by pushing the yellow reset at the end of the indicator.
Another type of air filter service indicator
is the Filter Minder® Single Position
Service Indicator. The clear window turns red when maximum
recommended restriction has been reached.
Every air induction filter system has a clean
filter or initial restriction reading. Depending on air flow
volume, filter media, and air filter size, there may not be
enough restriction to show a reading on the gauge with a new
filter, or the position indicator may move one or two positions.
Do not be alarmed if there is some restriction with a new
filter as this is not unusual.
Air filters usually show low restriction
through most of their service life. As the air filter nears
the end of available service life, filter restriction will
increase more rapidly, and the yellow position indicator on
the Filter Minder® will move more rapidly
towards the red zone. High humidity or rainy conditions may
slightly increase air filter restriction.
The Filter Minder® is calibrated in inches
of water vacuum per the engine manufacturer's recommendations.
Use of the Filter Minder® helps maximize filter service life, prevents excess fuel usage
from overly restricted filters, and saves on operational costs.