Advanced Technologies
15 June 2016

In the selection of the filter it is necessary to take into account the nominal protection factor, the type of filter used, the filtration capacity of the device and to analyze the conditions in which it operates.
NOMINAL PROTECTION FACTOR (N.P.F.)
It is necessary to know the concentrations and the occupational exposure limits related to the contaminants you want to protect from, on which ratio the minimum protection factor required will be determined1. The protection factor of the Personal Protective breathing equipments refers to intact and correctly used devices. Contaminants may be present in different forms, such as particulate gas or a combination of both.Therefore you must choose the type of filter that can offer greater protection for the risk.

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