1 / 5Mbetter 311i Max AllergenBlock Replacement Filters, 2-Pack
Mbetter 311i Max AllergenBlock filters are a two-pack of replacement filters listed for the Blueair Blue Pure 311i Max air purifier. Their stated two-stage design combines an air filter with activated carbon, while compatibility is specifically limited to the 311i Max model.
At a glance
- Listing identifies the Blueair Blue Pure 311i Max (F3MAX) as the compatible purifier.
- The stated two-stage arrangement pairs an air filter with activated carbon.
- The seller describes a round filter that unfolds to fit the purifier's filter cage.
Reference price: $52.99
Price checked: Nov 14, 2026
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Pros and cons
Pros
- Two filters are listed, which gives the buyer a spare replacement in the same purchase.
- Activated carbon is included in the stated filtration design, a useful feature for buyers also considering odor adsorption.
Technical specifications
9 specifications| Brand | Mbetter |
|---|---|
| Model | 311i Max AllergenBlock Filter |
| Dimensions listed | 17.9"L x 4.9"W x 11.41"Th |
|---|---|
| Weight listed | 1.02 kg |
| Compatible purifier | Compatible with 311i Max Air Purifier (F3MAX) |
| Filter shape | Round |
| Material listed | Activated Carbon Filter, Synthetic Material |
|---|---|
| Filtration design | 2-in-1 Filtration. With air filter and high-efficiency activated carbon filter |
| Number of items | 2 |
|---|
What to know before buying
Listing details to confirm
Compatibility claims are specifically for the Blue Pure 311i Max (F3MAX). The listing says it is not compatible with the Blue Pure 311, 311 Auto, or 311i+ Max. The listing's claims of trapping more than 90% of AllergenBlock particles and adsorbing 99.99% of particles as small as 0.03 micrometers are not accompanied by test details, and its 161 sq. ft room and 12-minute air-exchange statement is a seller claim rather than an independently established result. The listed sensor/reset compatibility is conditional on the purifier supporting a filter reset.
What’s in the box
- 2 replacement filtersCheck selected pack
Check which accessories are included in your selected pack before buying.
Who is it for?
A good fit for
- Owners of a Blue Pure 311i Max (F3MAX) seeking a two-filter replacement pack.
- Buyers looking for a replacement filter that combines an air-filter layer and activated carbon.
Less suited to
- Owners of Blue Pure 311, 311 Auto, or 311i+ Max purifiers, which the listing excludes.
- Buyers who need independently documented filtration performance or verified room-coverage results.
Customer reviews on Amazon
- 5 stars
76% 76% - 4 stars
13% 13% - 3 stars
0% 0% - 2 stars
2% 2% - 1 star
9% 9%
Aggregate ratings lean positive, with most ratings in the five-star category, but the smaller rating sample and the presence of some one- and two-star ratings do not reveal the reasons for those opinions. No written customer feedback is supplied, so there is no evidence here about fit, odor handling, or longevity. For buyers, the key practical question remains whether the filter fits the exact 311i Max model, since the listing expressly excludes nearby variants.
Frequently asked questions
Which purifier is this filter listed for?
The listing specifies the Blueair Blue Pure 311i Max, also identified as F3MAX. It says the filter is not compatible with the Blue Pure 311, 311 Auto, or 311i+ Max.
What filtration materials are described?
The listing describes an air-filter layer combined with activated carbon and identifies the material as activated carbon filter and synthetic material.
Does the listing provide verified filtration results?
No independent test evidence is supplied. The particle-removal and room air-exchange figures are seller claims, so treat them as unverified.
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