Allergen-related products use specific terminology that isn’t always explained. This glossary covers the terms you’re most likely to encounter.
- HEPA filtration captures 99.97% of particles at 0.3 microns, including most relevant allergens.
- CADR ratings help match air purifier capacity to your specific room size.
- Fel d 1 (cat) and Der p 1/Der f 1 (dust mite) are the specific allergen proteins triggering reactions.
- Allergen-proof encasements are specifically designed for particle blocking, distinct from standard mattress protectors.
Air Purifier Terms
HEPA (High-Efficiency Particulate Air): a filtration standard capturing 99.97% of particles at a specific size (0.3 microns), including most dust mite debris and pet dander particles. CADR (Clean Air Delivery Rate): a rating indicating how much filtered air a purifier produces per minute, useful for matching purifier capacity to room size.
Allergen-Specific Terms
Fel d 1: the primary cat allergen protein, found in saliva and skin (not just fur) — this is why even hairless cats can trigger reactions. Der p 1 / Der f 1: the primary dust mite allergen proteins, found in mite fecal matter, the actual allergenic component rather than the mites themselves.
Bedding and Textile Terms
Allergen-proof encasement: a tightly woven or membrane-based cover for mattresses/pillows specifically designed to block allergen particle passage, distinct from a standard mattress protector not designed for this specific purpose.
Filtration Terms That Are Easy to Confuse
True HEPA and phrases such as HEPA-type, HEPA-like or HEPA-style are not the same claim. The first refers to a defined filtration standard; the others are marketing constructions that borrow the word without committing to the standard behind it. If a listing uses one of the softer phrases, treat it as a filter of unstated performance rather than as a near-equivalent, and look for the manufacturer stating the standard explicitly.
MERV and HEPA are also different scales describing filters that sit in different places. MERV rates the disposable panel filter in a forced-air system, where the constraint is what the blower can push air through. HEPA describes the media in a standalone purifier or a vacuum, which has its own fan sized for the resistance. A higher MERV number is not a HEPA rating, and fitting a filter your system was not designed for can reduce airflow rather than improve it, which is a question for whoever services the system.
Activated carbon is a third category again. It targets odors and gases rather than particles, so it sits alongside particulate filtration rather than substituting for it. A unit described only as carbon-filtered is not making a particle-capture claim at all.
Marketing Language With No Fixed Definition
Hypoallergenic, allergen-reducing and antimicrobial are descriptive words rather than certified categories, and a product can carry any of them without a third party having verified anything. They are not automatically meaningless, but they are claims made by the seller, so the useful response is to look past the adjective for the specific mechanism underneath it: what is captured or blocked, by what, and according to whom.
The same applies to a capture percentage quoted with no particle size attached. Filtration performance depends entirely on the size of particle being tested, so a percentage on its own is not comparable between two products. Coverage claims work the same way: a stated room size means little without knowing how many times per hour the unit is expected to turn that room’s air over, which is the figure that actually determines whether it is sized for the space.
FAQ
What’s the difference between a mattress protector and an allergen-proof encasement?
A standard protector guards against spills/wear; an allergen-proof encasement uses a tightly woven or membrane-based design specifically to block dust mite allergen particle passage.
Does a higher furnace filter rating always mean cleaner air?
Not on its own. A denser filter only helps if your system can still move air through it, so check what the equipment manufacturer or your HVAC technician says your system is rated to accept before upgrading.
Is a carbon filter a substitute for a particle filter?
No. Carbon media targets odors and gases, which is a different job from capturing airborne particles. Units that do both say so separately, and a product described only as carbon-filtered is not claiming particle capture.
This glossary is for general orientation — refer to specific product certifications and labels for detailed specifications.
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.