"HEPA" gets printed on packaging far more loosely than the term technically allows, and knowing what to actually check separates genuine filtration from a marketing label.
True HEPA Has a Specific Standard
A genuine HEPA filter, technically graded H13 or higher, captures at least 99.95 percent of particles down to 0.3 microns. "HEPA-type" or "HEPA-like" filters, common vaguer phrasing, often meet a much lower capture rate without ever specifying the actual number.
Check for a Stated CADR Rating
Clean Air Delivery Rate tells you how much filtered air the unit actually moves per hour, which matters as much as filter grade, since a great filter in an underpowered unit still clears a room slowly. The Zenny Air Cube's specifications include this rating explicitly rather than leaving room size claims unverifiable.
Room Size Claims Deserve Scrutiny
A unit's stated coverage area should correspond to its CADR rating using a standard formula, not just an optimistic round number in the marketing copy. If a purifier claims to cover a large room without a CADR figure to back it up, that claim is essentially unverifiable.
The Honest Verdict
Look past the word "HEPA" alone, check for the H13+ grade specifically and a stated CADR rating. Together, these two numbers tell you far more about real performance than any marketing description on the box.
