Filter eliminates particles out of the air and the performance of filter depends on the type of aerator screens. Install aerator screens split into 2 floors, the first floor is not very good quality filters can krongonuphak have 20-40%. The second floor is 90% high quality filters, filtering systems of this type are used in various particle filtration protection to. Not be able to reach inside the building, and so the patient is secure against infections for surgery.
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