Before you buy
- Classic BF35-Pure is separate from FIT50 FF50-Pure and the numbered-i families.
- Fresh, VOC/Smoke and Odor products are not aliases or duplicate family pages added here.
- 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 BF35-Pure, components and quantity on the final merchant listing; the search does not approve the listed item or pack.
Filter and fitting details
- Classic product explicitly identifies BF35-Pure and says Fits Model: BreatheSmart Classic; code map independently repeats BF35-Pure.
- Each Classic filter includes an attached pre-filter. Pure is selected; carbon and odor variants have different references.
Manufacturer sources
Documentation checked Oct 13, 2026 by Codex (manufacturer documentation). We have not physically tested these filters.