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This is a five-pack of replacement filters for the Alen BreatheSmart 45i air purifier, sold under Alen's FLEX line. The filters are H13 medical-grade HEPA, which Alen rates for capturing fine particles down to 0.3 microns, and the FLEX line comes in several variants tuned to different environments. A five-pack suits owners who run the purifier continuously and want to keep spares on hand rather than reorder every few months. Against single-filter listings, the multi-pack cuts down on how often you have to think about replacements, but it locks you into one filter type for the life of the pack.
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Lowest price we've seen: $50.00 on Nov 15 at eBay. Tracked across 2 stores since Nov 15.
Owners rate the filters highly and describe them as a straightforward drop-in replacement that keeps the 45i running as expected. Most praise the filtration and fit; complaints are few and tend to be about cost and how often filters need changing.
They use medical-grade H13 HEPA filtration to capture small airborne particles.
The filters work together with the purifier's motor for a deeper, more thorough clean. Four filter options are available, so the purifier can be matched to a specific environment.
