1 / 5Mbetter 311 Auto Replacement Filters, 2-Pack
Mbetter 311 Auto replacement filters are a two-pack listed for the Blueair Blue Pure 311 Auto air purifier. Their activated-carbon filter construction and slide-in mounting are intended for owners replacing the filter in that specific model.
At a glance
- The listing specifies compatibility with the Blueair Blue Pure 311 Auto only.
- The seller says to replace the filter within 9 months depending on actual usage.
- The product description claims particle capture down to 0.03 micrometers, but this is a manufacturer claim, not an independent measurement.
Reference price: $49.99
Price checked: Nov 14, 2026
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Pros and cons
Pros
- Two filters are listed, giving buyers a spare for a later replacement.
- Customers report that installation is easy and that the filter has no unusual smell.
- Activated carbon is listed, and the described applications include odor reduction.
Technical specifications
14 specifications| Brand | Mbetter |
|---|---|
| Model | 311 Auto |
| Compatible air purifier model | Blueair Blue Pure 311 Auto |
|---|---|
| Compatible device type | Air Purifier |
| Mounting type | Slide In |
| Shape | Rectangular |
| Airflow direction | 360 Degree |
| Material listed | Activated Carbon Filter |
|---|---|
| Construction | Pleated |
| MERV rating | 13 |
| Dimensions listed | 1"L x 1"W x 1"Th |
|---|---|
| Weight listed | 1.6 pounds |
| Number of items | 2 |
|---|
| Common applications | Air Purification, Dust Filtration, Odor Reduction, Particle Filtration, Pet Dander Filtration, Pollen Filtration, Smoke Filtration |
|---|
What to know before buying
Listing details to confirm
Compatibility is model-specific. The listing says this fits Blueair Blue Pure 311 Auto and explicitly does not fit Blueair Pure 311. Customer feedback also reports fit problems, so confirm the purifier's exact model before ordering. The listed dimensions of 1"L x 1"W x 1"Th appear inconsistent with the stated round replacement design and should not be treated as a confirmed physical size. The listing's claimed particle-capture performance and fit are not independently confirmed. The stated replacement interval is within 9 months depending on actual usage.
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?
Customer reviews on Amazon
- 5 stars
72% 72% - 4 stars
9% 9% - 3 stars
3% 3% - 2 stars
3% 3% - 1 star
13% 13%
Customer feedback describes the filter as easy to install and notes that it has no unusual smell. Fit and compatibility feedback is mixed, including reports that it does not fit the Blueair Pure 311, which matches the listing's warning that this is for the 311 Auto rather than the non-Auto model. Opinions on quality and value also vary. For buyers, verifying the purifier model is especially important, while the feedback does not establish uniform performance or durability.
Positive themes
- Customers describe installation as easy.
Negative themes
- Some customers report that it does not fit the Blueair Pure 311.
Mixed feedback
- Feedback on quality and value is mixed, with some customers satisfied and others dissatisfied.
- Customers' odor feedback is mixed, despite some reports of no unusual smell.
Frequently asked questions
Which purifier is this filter listed for?
The listing specifies the Blueair Blue Pure 311 Auto. It says the filter is not compatible with the Blueair Pure 311, so check the exact model name on your purifier.
How many filters are in the pack?
The product title and listing details specify two filters.
How often does the listing recommend replacing the filter?
It suggests replacement within 9 months, depending on actual usage.
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