Air Purifier comparison
True HEPA vs HEPA-Type Air Purifier: What's the Difference?
By the WhatSize editorial team 5 min read Standards-reviewed
The word “HEPA” on a box doesn't always mean the same thing. True HEPA (sometimes just labeled HEPA) meets the official standard: it captures 99.97% of particles at 0.3 microns — the hardest-to-trap size — which covers pollen, dust mites, dander, and smoke.
HEPA-type (also sold as “HEPA-like,” “99% HEPA,” or “HEPA-style”) is a marketing term for filters that resemble HEPA but don't meet the standard. They often capture around 99% at a much larger 2 microns, letting the finest, most harmful particles slip through. The fix is simple: read the label, not the buzzword.
True HEPA vs HEPA-Type: Side-by-Side
| Factor | True HEPA | HEPA-Type |
|---|---|---|
| Meets HEPA standard | Yes (99.97% @ 0.3 micron) | No (no official standard) |
| Fine-particle capture | Excellent | Weaker (misses 0.3 micron) |
| Typical label wording | “True HEPA” / “HEPA” | “HEPA-type/like/99%” |
| Allergens & smoke | Effective | Less effective |
| Typical price | Higher | Lower |
| Best for | Allergies, asthma, smoke | Light dust, budget, supplement |
When to choose True HEPA
- You have allergies, asthma, or live with pets
- You're filtering wildfire or cigarette smoke (fine particles)
- You want certified 99.97% capture you can rely on
- The purifier is your primary air-cleaning device
- You'd rather pay a bit more than gamble on vague filter claims
When to choose HEPA-Type
- Your budget is tight and needs are light
- You're only dealing with larger dust, not fine particles or allergens
- It's a secondary unit in a low-priority room
- You've checked the actual rating and accept what it does and doesn't capture
- No one in the home has asthma, severe allergies, or smoke sensitivity
Frequently asked questions
What's the difference between True HEPA and HEPA-type?
True HEPA is a certified standard: 99.97% of particles captured at 0.3 microns. 'HEPA-type' is a marketing label with no official standard — these filters often capture around 99% at 2 microns, so they miss the smallest, most harmful particles that True HEPA catches.
Is a HEPA-type filter good enough for allergies?
Usually not. Allergens like fine dust and dander, plus smoke, are at the small particle sizes that HEPA-type filters tend to miss. For allergies, asthma, or smoke, choose a True HEPA purifier rated 99.97% at 0.3 microns.
How do I know if a filter is True HEPA?
Look for the exact phrase '99.97% at 0.3 microns' (or 'True HEPA') on the box or spec sheet. Treat vague terms like 'HEPA-type,' 'HEPA-like,' 'HEPA-style,' or 'up to 99%' as red flags that it doesn't meet the standard.
All Air Purifier sizing guides
More air purifier sizing guides
- What Size Air Purifier for a Bedroom? CADR Guide
- What Size Air Purifier for a Large Room (500+ Sq Ft)?
- What Size Air Purifier for a Living Room?
- What Size Air Purifier Do Pet Owners Need?
- What Size Air Purifier Do You Need for Allergies?
- How Many Air Changes per Hour Do I Need? (ACH Chart)
- What Is CADR? Air Purifier Sizing Explained
- What Size Air Purifier for Smoke and Wildfire? CADR Guide
- What Size Air Purifier for an Office or Home Office?
- What Size Air Purifier for a Basement?
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