High Efficiency Particulate Air, or HEPA, filters use deeply-folded media to trap particles.  With efficiency ratings of close to 100%, true HEPA filters are the top performers in the air cleaner circle and are used in settings where perfectly clean air is the highest priority.
It takes a powerful fan or blower to move air through a HEPA filter, which rules out their use in typical central system, forced-air applications.  But they are perfectly suited for portable air cleaning in conjunction with a powerful fan.
Applications where central system HEPA filters are found include hospital burn-patient rooms and clan-room manufacturing areas.
Some manufacturers offer "HEPA-like" or "HEPA-type" filters.  These filters are actually extended-surface media filters and have efficiency ratings of only 10% to 35%.


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