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HEPA 14 is the highest practical grade of HEPA filtration used in consumer air purifiers. Classified under the European EN 1822 standard, HEPA 14 filters capture 99.995% of particles at 0.3 microns — the most penetrating particle size. The AirPro’s HEPA 14 filter captures 99.9% of particles down to 0.1 microns, providing medical-grade air cleaning for your home.

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What Is HEPA 14?

HEPA stands for High Efficiency Particulate Air. HEPA filters use a dense mat of randomly arranged fibers to trap particles through three mechanisms:
  • Interception — Particles following an airstream come within one radius of a fiber and adhere to it
  • Impaction — Larger particles cannot follow the airstream around fibers and collide directly
  • Diffusion — The smallest particles move erratically (Brownian motion) and eventually contact a fiber
HEPA 14 represents the second-highest grade in the EN 1822 classification system. It is the standard used in hospital operating rooms, pharmaceutical manufacturing, and semiconductor cleanrooms.

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HEPA Grade Comparison

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HEPA 14 vs. Standard HEPA

The difference between HEPA 13 (standard HEPA) and HEPA 14 is significant: In practical terms, HEPA 14 lets through 10 times fewer particles than standard HEPA at the most penetrating particle size.

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Why “HEPA-Type” Is Not HEPA

Many budget air purifiers advertise “HEPA-type” or “HEPA-style” filters. These are not true HEPA filters and are not tested to any recognized standard. A HEPA-type filter may capture only 85-95% of particles at 0.3 microns, compared to HEPA 14’s 99.995%. This means a HEPA-type filter lets through 100 to 1,000 times more particles than a HEPA 14 filter. When evaluating an air purifier, look for a specific HEPA grade (H11 through H14) and a reference to the EN 1822 or equivalent testing standard. Note that “True HEPA” is a marketing term that usually means HEPA 13, not HEPA 14 — see HEPA 14 vs. True HEPA for the full breakdown.

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The AirPro’s HEPA 14 Filter

The AirPro’s HEPA 14 filter includes two additional features beyond standard HEPA 14 media:
  • Antibacterial Coating — Prevents bacteria and mold from growing on the filter surface over time. Without this coating, captured biological particles can multiply on the filter and eventually release back into the air.
  • Antimicrobial Layer — An additional protective layer that provides a second line of defense against microbial growth within the filter assembly.
These coatings are particularly important for long-life filters. The AirPro’s filter lasts 6-12 months, and the antibacterial properties ensure the filter remains hygienic throughout its service life.

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What HEPA 14 Captures

Related: HEPA 14 vs. True HEPA · Best HEPA 14 Air Purifier · How It Works · UV-C Sterilization · Filter Replacement Guide