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The discovery of this concept overturned conventional wisdom:. Most penetrating particle size (mpps) refers to the particle size that is most difficult to capture. Mpps , or most penetrating particle size, describes the particle size with the highest penetration rate in a given filter.

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The mpps of a filter.

This is a term widely used in academia and the construction field,.

Each hepa filter is measured against the mpps (most penetrating particle size) to ensure its effectiveness against even the smallest airborne contaminants. This unique point is known as the most penetrating particle. They are referred to as the “most penetrating particle size” (mpps). The most penetrating particle size (mpps) is the particle diameter at which a given filter medium exhibits its lowest collection efficiency.

Mpps testing represents the only credible benchmark because it challenges the filter at its point of minimum efficiency. Mpps, the abbreviation of ‘most penetrating particle size’, literally means ‘maximum penetrating particle size’.