HEPA H13 vs H14 — What's the Real Difference?

• H13 filters capture 99.95% of particles at 0.3 microns
• H14 filters capture 99.995% at 0.3 microns

That's a 0.045% difference in efficiency.

Both are classifications under the EN 1822 European HEPA standard.

HEPA filters are tested at their Most Penetrating Particle Size (MPPS) — typically around 0.3 microns.

This size is important because:

• It's harder to capture than larger particles
• If a filter stops 0.3 microns efficiently, it stops bigger ones even better

That extra 0.045% in H14 means:

H13 is ideal for:

• Allergies
• Pet dander
• Pollen
• Wildfire smoke
• Urban pollution
• Mold spores

H14 is beneficial if:

• You are severely immunocompromised
• You run a medical clinic at home
• You want maximum theoretical filtration

• Higher resistance → stronger fan required
• Louder operation possible
• Higher energy use
• More expensive replacement filters

Filtration class alone doesn't guarantee clean air. You must consider:

• CADR (Clean Air Delivery Rate)
• Room size coverage
• Air changes per hour (ACH)
• Sealed system design

Yes — technically.

But "medical grade" doesn't mean necessary for a living room.