Air purifier for allergies: what to choose
For allergies, the goal is to reduce particulate matter (pollen/dust). Units with HEPA insulation are the most effective for this type of use.
What to look for
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HEPA (or "classified" HEPA) + pre-filter
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CADR appropriate for the room size (do not buy "undersized")
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Silent sleep mode + easy-to-replace filters
Practical tip
In the bedroom, try operating for longer periods at medium power (less noise and more consistency).