Filtration efficiency measurement method, what is MPPS?

MPPS:

(1) MPPS method is currently the mainstream test method for high-efficiency air filters in the world;

(2) The working principle is to continuously scan the entire air outlet surface of the air filter with a counter, and count the number and particle size of each point of dust. This method can not only measure the average filtration efficiency of the air filter, but also The local filtration efficiency of each point can be compared;

(3) MPPS method is used to measure the filtration efficiency of the filter to the most easily penetrated dust particle size. European experience shows that the most easily penetrated dust particle size is at a certain point between 0.1μm - 0.25μm , the American standard simply stipulates that only the 0.1μm - 0.2μm interval is measured;

(4) MPPS method is the most stringent method for testing high efficiency filters, and it is an inevitable trend to use it to replace various other traditional testing methods.

Related standards:

American Standard: IES - RP - CC007.1 - 1992

European Standard: EN 1882.1 ~ 1882.5 - 1998 ~ 2000