['Particulate', 'Air)', 'filter.', 'This', 'filter', 'mist', 'meet', 'rigid,', 'specific', 'standards', 'of', 'efficiency', 'before', 'it', 'can', 'be', 'truely', 'called', 'HEPA.', 'HEPA', 'is', 'the', 'only', 'particulate', 'filter', 'used', 'where', 'large', 'volumes', 'caf', 'clean', 'air', 'are', 'involved', 'with', 'the', 'protection', 'of', 'human', 'life.', 'It', 'is', 'used', 'in', 'arthopedic', 'operating', 'rooms', 'to', 'deter', 'bone', 'infection,', 'in', 'hospital', 'burn', 'units,', 'chemotheropy', 'wards,', 'preparation', 'of', 'IV', 'add', 'mixtures,', 'pharmaceutical', 'production,', 'radioactive', 'particle', 'confinement,', 'and', 'in', 'the', 'biological', 'safety', 'cabinets', 'used', 'for', 'cancer,', 'DNA,', 'and', 'infecteous', 'disease', 'research,', 'Because', 'of', 'its', 'extremely', 'high', 'efficiency', 'at', 'capturing', 'extremely', 'small', 'particles,', 'the', 'HEPA', 'filter', '15', 'well', 'suited', 'to', 'any', 'application', 'where', 'improved', 'IA@', 'is', 'desired.', 'In', 'many', 'instances,', 'HEPA', 'filters', 'have', 'been', 'successfully', 'used', 'in', 'commercial', 'buildings', 'to', 'augment', 'ventilation.', 'They', 'are', 'the', 'best.', 'Unfortunately,', 'for', 'some', 'particulate', 'contaminents,', 'there', 'is', 'no', '“second', 'best”.', 'In', 'cases', 'where', 'lesser', 'filters', 'were', 'used,', 'and', 'failed,', 'a', 'lack', 'of', 'this', 'understanding', 'resulted', 'in', 'negative', 'attitudes', 'toward', 'filtration.', 'In', 'addition', 'to', 'its', 'use', 'in', 'commercial', 'buildings,', 'HEPA', 'filtration,', 'im', 'conjunction', 'with', 'adsorbants,', 'properly', 'installed', 'in', 'the', 'recirculating', 'systems', 'of', 'aircraft,', 'would', 'do', 'much', 'to', 'improve', 'the', 'air', 'traveler’s', 'environment.', 'Properly', 'filtered', 'recirculation', 'air,', 'in', 'most', 'cases,', 'would', 'double', 'the', '“fresh', 'air“', 'supplied', 'to', 'each', 'passenger.', 'In', 'addition', 'to', 'reducing', 'the', 'drain', 'on', 'the', 'main', 'engines', 'and', 'removing', 'inside', 'source', 'contaminents,', 'the', 'use', 'of', 'larger', 'volumes', 'cf', 'filtered', 'recirculating', 'air,', 'and', 'less', 'from', 'the', 'engines,', 'would', 'reduce', 'the', 'intake', 'of', 'ozone', 'and', 'result', 'in', 'a', 'more', 'comfortable', 'relative', 'humidity', 'condition', 'in', 'the', 'cabin.', 'Some', 'kind', 'of', 'filters', 'are', 'currently', 'being', 'used', 'in', 'the', 'aircraft', 'industry,', 'but', 'apparently', 'with', 'less', 'than', 'the', 'T11041-1530']