Mini – pleat typeHepa and Ulpa filters use thin strips of corrugated separators. Moreimportantly by eliminating the corrugated aluminum separators the filterout performs the corrugated separator typefilters which may betwice as deep. So themini pleat type Hepafilters meet today's cleanair environment needsand are ideal for situations where spaceweight and energysavings are criticalrequirements..