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Compact motor / fan design allows more space for filtration Motor and electric parts out of the airflow Other systems blow clean air over the motor and recontaminate it Unique pressure seal The pressure seal system on the filter chamber ensures that all the impurities pass through the filters. Other systems allow dirty air to escape and fail to acheive their promised HEPA rating of 99.97% filtration Powdercoat steel housing Robust construction. No plastic vapors. Easy Change Pre-filter Pad