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Q: What is a micron?
A: A micron is a thousandth of a millimeter or a millionth of a meter (= .000039 of an inch). Micron is the unit of measure used to determinate the size of particles in a fluid which are filtered out by the filter.

Q: What is the difference between Absolute and Nominal micron rating?
A: Micron rating is the size of particles which are filtered out by filters at a certain efficiency. When this efficiency is at least 98.6%, we speak about absolute micron rating/filtration. Nominal micron rating is just a commercial trick for all efficiencies lower than 98.6%, meaning that for the same micron rating (for ex. 10 µ) in the case of nominal rating, not all particles will be captured in the filter as in the case of absolute micron rating.

Q: Why doesn't Cummins Filtration publish micron ratings for all its filters?
A: Generally this is not necessary. Cummins Filtration filters are designed to meet or exceed OEM specifications.

Q: In your catalog, under Product Guide, you mention a by-pass setting for lube and hydraulic filters. What is this?
A: Each lube filter and hydraulic filter system is equipped with a by-pass valve to ensure that main components in the system are sufficiently lubricated independently-if oil is cold or the filter is blocked by excessive contamination. This by-pass valve can be located in the filter or filter head. Depending on the OEM manufacturer's specification, the setting of the by-pass valve can be different. So in the Cummins Filtration Master Filter Catalog, we mention the setting of this valve (14.7 PSI=1 bar). If no setting is mentioned, no by-pass valve is mounted in the filter.

Q: In your catalog, under Product Guide, you mention anti-drainback valve for lube and hydraulic filters. What is this?
A: An anti-drainback valve is fitted in filters for applications where there is risk that the filter is running empty. This situation should be avoided-otherwise wear will occur on the moving parts, as these parts are not yet lubricated by oil.

Q: What does Two-Stage/Dual-Stage Air Cleaner mean?
A: A two-stage air cleaner has a pre-cleaner integral to the system. For example, in most heavy duty applications, the air cleaner will have a dust ejection valve. The majority of the heavy dust particles will be removed from the air cleaner by this valve (stage 1). The remaining dust will then be removed from the air by the primary filter element (stage 2).

Q: For a two-stage air cleaner, does the orientation of the dust ejection valve make a difference?
A: Yes. The dust ejection valve must be pointed within 15° of down to have proper pre-cleaning abilities.

Q: What information is required to select a Fleetguard Pre-Cleaner?
A: You will need to know the air flow rate (m3/min. or ft3/min.) and the outside diameter of the intake pipe onto which it will connect. If you are not sure of the engine air flow rate, please contact your Fleetguard distributor partner for further information.

Q: Does the efficiency of an air filter element change while it is being used?
A: Yes, air filter element efficiency changes over time. Air filter elements are least efficient when they are new. The build up of contaminant (dirt) on the medium will make it more efficient over time.