HEPA 14 Medical-Grade Filtration

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.

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.

HEPA Grade Comparison

Grade	Standard	Efficiency at 0.3 microns	Typical Use
HEPA-type	No standard	85-95%	Budget consumer purifiers
HEPA 11 (H11)	EN 1822	95%	Basic commercial HVAC
HEPA 12 (H12)	EN 1822	99.5%	General commercial filtration
HEPA 13 (H13)	EN 1822	99.95%	Consumer air purifiers, hospitals (general areas)
HEPA 14 (H14)	EN 1822	99.995%	Operating rooms, cleanrooms, the AirPro
ULPA 15 (U15)	EN 1822	99.9995%	Semiconductor fabrication

HEPA 14 vs. Standard HEPA

The difference between HEPA 13 (standard HEPA) and HEPA 14 is significant:

Factor	Standard HEPA (H13)	HEPA 14 (H14)
Efficiency at 0.3 microns	99.95%	99.995%
Particle penetration	5 in 10,000 pass through	5 in 100,000 pass through
Relative leakage	Baseline	10x less leakage
Classification	Consumer-grade	Medical-grade
Testing standard	May vary	EN 1822 certified

In practical terms, HEPA 14 lets through 10 times fewer particles than standard HEPA at the most penetrating particle size.

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.

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.

What HEPA 14 Captures

Pollutant	Particle Size	Captured by HEPA 14
Pollen	10-100 microns	Yes
Mold spores	2-20 microns	Yes
Dust mite waste	1-10 microns	Yes
Pet dander	0.5-10 microns	Yes
Bacteria	0.3-5 microns	Yes
Fine dust (PM2.5)	< 2.5 microns	Yes
Smoke particles	0.1-1 micron	Yes
Some viruses	0.02-0.3 microns	Yes (via diffusion mechanism)

​What Is HEPA 14?

​HEPA Grade Comparison

​HEPA 14 vs. Standard HEPA

​Why “HEPA-Type” Is Not HEPA

​The AirPro’s HEPA 14 Filter

​What HEPA 14 Captures