Alen replacement filters by model

Original replacement filters listed for Alen air purifiers, each with the manufacturer page for this market. Keep every suffix of your model label.

Purifier model	Brand	Original filter	Source and record
BreatheSmart 45iAlen · US source	Alen	BreatheSmart 45i & FLEX HEPA Filter	Manufacturer page ↗Exact model stated · checked 2026-10-20
BreatheSmart FLEXAlen · US source	Alen	BreatheSmart 45i & FLEX HEPA Filter	Manufacturer page ↗Exact model stated · checked 2026-10-20
BreatheSmart 75iAlen · US source	Alen	BreatheSmart 75i HEPA Filter	Manufacturer page ↗Family or catalog listing · checked 2026-10-20
BreatheSmart ClassicAlen · US source	Alen	BreatheSmart Classic HEPA Filter	Manufacturer page ↗Family or catalog listing · checked 2026-10-20

Evidence for each model

Alen BreatheSmart 45i · BreatheSmart 45i & FLEX HEPA Filter

Wording is the page title; variants Essential (Pure), Advanced (Fresh), Ultimate (Odor). Body copy has no separate compatibility sentence.

Alen BreatheSmart FLEX · BreatheSmart 45i & FLEX HEPA Filter

Same filter as 45i. Body copy has no separate compatibility sentence.

Alen BreatheSmart 75i · BreatheSmart 75i HEPA Filter

Model-named filter product; no explicit fits sentence. Does not establish fit for 75i Pre-filter or other accessories.

Alen BreatheSmart Classic · BreatheSmart Classic HEPA Filter

Model-named filter product; no explicit fits sentence. Does not establish which Classic hardware revisions it fits.

Use this text to cite the page. The last-updated date is the date of the latest change to its content.

Filter Ledger. “Alen Replacement Filters by Model”. https://filters.toolatlas.app/en-us/brands/alen/. Last updated October 21, 2026.