Engine Air Cleaners, Intake Accessories and ... - Giro Servicios CA

Filtration
Micron ratings are commonly used to convey
filtration performance in liquid filtration. Because
of this, we often are asked what our micron ratings
are for a particular air filter or air cleaner.
Typically, air cleaners and air filters are not
assigned a micron rating.
To evaluate the life and efficiency performance of
air filters, filtration manufacturers use standard
industry recognized tests; i.e., SAE and ISO. These
standards provide a basis for comparison among
products, models and manufacturers. The test most
commonly used is the SAEJ726 Air Cleaner Test
Code (SAE = Society of Automotive Engineers).
The following is an excerpt from the SAEJ726 test
code:
“Filter life is measured in total grams fed or in hours
of lab life and is determined by testing at a standard
test dust concentration of (1 gram/cubic meter or
0.028 grams/cubic foot) at either a constant or
variable airflow. The end of the life testing is
determined using the restriction method. When the
predetermined restriction service point is reached,
the test is stopped and the filter is weighed. The
amount of test dust held by the filter is considered
the capacity or life of the filter. The life of an air
cleaner requires some additional consideration.”
Many of the Donaldson air cleaners have inertial
separators included in the housing. These inertial
separators remove up to 98% of the dust that is
fed during one of these tests. Therefore, the inertial
separator efficiency must also be evaluated.
Filtration efficiency is calculated by determining
the increase in weight of an absolute filter (an
absolute filter captures any dust that passes the test
filter) located downstream of the test filter vs. the
weight of the total dust fed.
efficiency
Life & Efficiency Ratings
...Donaldson air filters in Donaldson air cleaner
housings have a 99.99+% minimum overall efficiency.
Particle Size Distribution by
Weight % of Fine & Coarse Test Dust
The fine test dust is used for testing primary dry, single stage
air cleaners, which are most often used in on-road
applications. Coarse test dust is used for two-stage air
cleaners that typically use inertial separators and operate in
very dusty applications.
Particle Size ----- Weight % ----
(in microns) Fine Coarse
0 - 5 39 ±2% 12 ±2%
5 - 10 18 ±3% 12 ±3%
10 - 20 16 ±3% 14 ±3%
20 - 40 18 ±3% 23 ±3%
40 - 80 9 ±3 % 30 ±3%
80 - 200 0% 9 ±3%
Common Contaminants by Micron Size
Although field conditions vary from one location to the next
and from time to time, this test allows for a standard means of
comparison and a laboratory method of evaluating air cleaner
life and efficiency.
Exhaust Soot
.01 0.1 1.0 10 100 1,000 10,000
Particle Sizes in Microns
www.donaldson-filters.com Engine Air Cleaners, Accessories & Service Parts 97
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