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Alen replacement filter

Alen BreatheSmart 35i

Alen lists Essential (Pure) HEPA filter for 35i for US BreatheSmart 35i. The Amazon action is a reference search without an approved retail item or pack.

Models listed by the manufacturer

BreatheSmart 35i

Models checked: US. Match the full code on your label.

Where is my model number?

Manufacturer-listed filter

Essential (Pure) HEPA filter for 35i

B3-Pure

Reference searchNo exact Amazon product or pack has been approved for this reference.

This is a reference search. Compare the manufacturer filter code, brand, components and quantity on the final listing. Search results do not approve a product or pack.

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Before you buy

Keep BreatheSmart 35i distinct from BreatheSmart 25i even where the support table gives inconsistent Essential aliases.
A pre-filter layer or spare pre-filter pack does not replace the main B3-Pure HEPA filter.
These manufacturer-listed US model codes do not approve another regional variant. The Amazon action is a reference search, without an approved product, seller or pack.

Find the complete model code

Read the complete Alen model on the purifier label and retain every letter, digit and suffix.
Match the label with one of the manufacturer-listed US codes on this page.
Compare B3-Pure, components and quantity on the final merchant listing; the search does not approve the listed item or pack.

Filter and fitting details

Code map associates 35i Pure with B3-Pure; the product describes Essential (Pure) as formerly B3 Pure.
Pure is kept separate from Fresh and Odor options; their additional layers and references are not combined.

Manufacturer sources

Documentation checked Oct 13, 2026 by Codex (manufacturer documentation). We have not physically tested these filters.

Alen filterB3-Pure