1 / 7Pulluty 45i Replacement Air Purifier Filter
Pulluty 45i is a replacement filter listed for Alen BreatheSmart Flex and 45i air purifiers. Its listing describes a three-stage set with H13-grade True HEPA media and activated carbon, plus extra pre-filters. Confirm the model fit and included quantities before ordering.
At a glance
- The listing names Alen BreatheSmart Flex and 45i as compatible purifier lines.
- Described as a three-stage system with a pre-filter, H13-grade True HEPA filter and activated carbon filter.
- The seller recommends replacing the HEPA filter set every 9–12 months and pre-filters every three months.
Reference price: $35.99
Price checked: Nov 14, 2026
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Pros and cons
Pros
- Includes an advertised set of extra replaceable pre-filters, which can support periodic pre-filter changes without buying them separately.
- The listing says installation requires no tools.
Technical specifications
8 specifications| Brand | Pulluty |
|---|---|
| Model | 45i |
| OEM part number | B4-Fresh |
| Fit type | Universal Fit |
| Filtration claim | Works 99.97% of airborne particles as small as 0.3 microns in size |
|---|---|
| Recommended HEPA set replacement | every 9-12 months |
| Recommended pre-filter replacement | every 3 months |
| Number of items | 1 |
|---|
What to know before buying
Listing details to confirm
Listing details are inconsistent: the title mentions B4-Pure / FL40, while the product details and compatibility bullet identify B4-Fresh and an older FL40-Silver-Carbon part number. The advertised two filter systems and six extra pre-filters also differ from the detail fields stating one item and one pack. Verify the selected listing's exact part number and package contents before purchase.
Who is it for?
A good fit for
- Owners of an Alen BreatheSmart Flex or 45i purifier who have confirmed the replacement part number and bundle contents.
- Buyers looking for a filter set advertised with H13-grade True HEPA, activated carbon and extra pre-filters.
Less suited to
- Owners of other purifier models, since the stated compatibility is limited to BreatheSmart Flex and 45i.
- Buyers who need confirmed carbon-filter composition or a package quantity that is not verified against the selected listing.
Customer reviews on Amazon
- 5 stars
77% 77% - 4 stars
10% 10% - 3 stars
3% 3% - 2 stars
2% 2% - 1 star
8% 8%
Customer feedback reports reduced dust and dust mites, easy installation and favorable value, while experiences with filter life are mixed and the filter material draws criticism. One reported concern is the absence of an activated-carbon layer found in Alen filters, which matters for buyers relying on odor filtration. The listing itself describes an activated carbon filter, so verify the actual filter construction if carbon is important. Aggregate ratings lean positive overall but do not resolve that material concern.
Positive themes
- Customers report that the filter reduces dust and dust mites.
- Customers appreciate easy installation and value.
Negative themes
- Some feedback criticizes the filter material, including a report that it lacks the activated-carbon layer found in Alen filters.
Mixed feedback
- Feedback about filter life is mixed.
Frequently asked questions
Which air purifiers is this filter listed for?
The compatibility claim names Alen BreatheSmart Flex and 45i air purifiers. Check your purifier and replacement part number, especially because the title and details list different part references.
What does the advertised set contain?
A feature bullet claims two three-stage filter systems and six extra replaceable pre-filters. Detail fields instead state one item and one pack, so confirm the package contents on the selected listing.
How often does the listing recommend replacing the filters?
It recommends replacing the True HEPA filter set every 9–12 months and the pre-filter every three months.
What filtration performance is claimed?
The listing claims the filter works on 99.97% of airborne particles as small as 0.3 microns. This is a seller claim, not an independently verified result.
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