TYPES OF FILTERS
Dust filters are able to retain airborne particulates and are offered in various constructions, which enhance the filters characteristics with use of various types of filter material with different thickness, porosity and surfaces, to protect against particulates, gases and nuisance odors. Activated carbon cartridge filters contain specific activated carbon, which retain certain gases and vapors by adsorption, while combined filters can remove both gases, vapors and particulates.
TECHNICAL CHARACTERISTICS OF FILTERS
There are various types of particulate dust filters which have different filtration efficiency. Depending on which you choose, you can have the most suitable means of protection against environmental pollution conditions. The airborne particles are retained by the filter by means of mechanical and/or electrostatic action.
In the case of gas filters, substances are retained by the chemical-physical action of activated carbons in the filter, able to adsorb and neutralize contaminants.
It is assumed that the efficiency of gas and vapor interception on adsorbent material is 100%, at least until the completion of the capacity of the filter material. For gas filters, we refer to; time to completion or, rather, the period beyond which the filter is saturated and the pollutant begins to pass through the filter. This 'breakthrough' time depends on the quantity of adsorbent material used, on its filtration capacity against the pollutant and on environmental concentrations.
Protection against particulates (dust, mists and toxic fumes)
NIOSH approved respiratory filters have different classes of protection for removal of any particle including oil-based liquid aerosols, with increasing efficiency. Particulate filters are classed as N, R, or P combined with 95, 99, or 100
N - Not resistant to oil mist
R - Resistant to oil mist
P - Protective against all particulates
95, 99, 100 - approximate filter efficiency in % against 0.3 micron particles
P100 particulate Filters capture at least 99.97% of 0.3 micron airborne particles. They are strongly resistant to oil mist.
P100 filters are distinguished by the Magenta color.
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