The air in these area can be one of the greatest source of contamination.so it has to be made
free form dust particle as well as micro-organisms. this may be done by a series of treatments that well very form one installation to the other in one such series air from onside is first passed through a prefilter, usually of glass wool to remove bigger particle.then it is passed throw a electric precipitator
such a unit induces an electrostatics charge on particles and remove them by attraction to oppositely charged plates. the air then passes through the most efficiency cleaning device, a HEPA (high Efficiency particulate air) filter having an efficiency of at least 99.97% in removing particles of
0.3 mm and larger based on the DOP (Dioctyl phathalate) teste
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