How To Read Engine Air Filter Ratings

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Nosotros are often asked how well our air filters make clean the air supplied to the engine for combustion. This may be when customers are looking to improve their current air cleaner.

A common question is: "what micron rating is it?". However, a micron rating is an efficiency measurement used for liquid filters and non used for describing air filter efficiency.

Air filter elements are evaluated using an industry wide standard (ISO5011) and their performance is expressed equally an efficiency level.

This efficiency level is determined by feeding air containing a known concentration of standard test dust into the air cleaner until the filter reaches the end of its life. This end of life is when the brake reaches a predetermined level. The use of a standard examination dust ensures consistency and is representative of the size range of dust particles found in existent atmospheric condition.

When the filter reaches the end of its life, the weight of the dust on the filter is considered the capacity of the filter. Any grit, which passes the filter, is captured by an accented filter down stream of the air cleaner in the test laboratory.

The weight of the dust captured past the absolute filter is compared to the weight of the dust fed into the air cleaner. The departure between them is the efficiency of the filter expressed as a percentage.

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The efficiency of an air filter will increase as dust accumulates on the filter surface, right upwards to the betoken at which it needs to exist replaced. This is why it is of import to let an air filter to do its task properly and not change information technology prematurely. In other words, an air filter that is allowed to accomplish the stop of its life volition piece of work meliorate than filters that are changed more often.

Measuring the Percent of Particles Trapped by the Filter

These grit vials testify the bodily amount of fine exam dust that passes through the air filter media for every one kilogram of dust fed to the air filter, which is equivalent to 100 hours* of equipment operation.

Up to 99.999% Filtration Efficiency (0.01 gram grit)

Up to 99.99% Filtration Efficiency (0.1 gram dust)

Upwards to 99.9% Filtration Efficiency (one gram dust)

Upwardly to 99.0% Filtration Efficiency (10 gram dust)

Will-fit filters can permit up to 100 times more clay to laissez passer through the filter into the engine than Donaldson Blue air filters with Ultra-Web filter media.

* Estimate based upon typical medium dust operating conditions with 92% pre-cleaner efficiency. Actual results may vary.

Did You Know?

Donaldson air filters in Donaldson air cleaner housings have a minimum overall efficiency greater than 99.ninety%. The efficiency of the filter actually improves as dust accumulates on the surface of the filter, and then an air filter gets better as it gets used.

So how do you determine when the filter has reached the stop of its life?

Don't judge a filter by its appearance! The only practical way is to mensurate the restriction level, using a restriction indicator or approximate. All combustion engines are designed to operate with some restriction, and the manufacturer will specify the maximum acceptable level for their engine. This is the signal at which you lot should change your filter. The condition of an air filter cannot be determined past its appearance.

Become the maximum protection for your engine and relieve money by allowing your air filter to work for its unabridged filter life.