# Mbetter 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.

- [Original product page](https://best-deals.pro/product/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [View offer](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- Market: US
- Language: en-US
- Currency: USD
- Brand: Mbetter
- Model: 311i Max AllergenBlock Filter
- Category: Home & Kitchen > Appliance Parts & Accessories > Air & HVAC Filters
- Price: 45.04 USD
- Previous price: 52.99 USD
- Discount: 15%
- Price checked: 2026-11-14T06:37:12.114Z
- Rating: 4.4 / 5
- Reviews: 30

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## 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.

## Specifications

### Identity
- Brand: Mbetter
- Model: 311i Max AllergenBlock Filter
### Dimensions and installation
- 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
### Materials and filtration
- Material listed: Activated Carbon Filter, Synthetic Material
- Filtration design: 2-in-1 Filtration. With air filter and high-efficiency activated carbon filter
### Pack quantity
- Number of items: 2

## Before you buy

- 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.

## In the box

- 2 replacement filters (Check selected pack): The product title and listing describe a two-pack.

## 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 feedback

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.

## Alternative options

- [311i Max Replacement Filter for Blueair Blue Pure 311i Max Air Purifiers \| 2-in-1 311i Max Filter with Activated Carbon Filter, Blue Pure F3MAX, White, 2 Pack](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [2Pcs Blue Pure 311i Max Air Purifier Filter Replacement【Not For 311i+ Max】 \| H13 Tr...](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [411i & 411a Max AllergenBlock Filters for Blue Pure 411i Max 411a Max \| Air Puri-fi...](https://best-deals.pro/visit/mbetter-allergenblock-filter-blue-pure-411i-411a-max)
- [2 Pack 311 Auto Replacement Filters for Blue Pure 311 Auto \| Air Purifier, 2 in 1 H...](https://best-deals.pro/visit/mbetter-311-auto-replacement-filters-2-pack)
- [Blue Pure Replacement Filter for Blueair 411, 411+, 411 Auto Air Purifier \| 2-IN-1 Efficient Particulate Activated Carbon 411, 411+, 411 Auto and MINI Filter for Smoke, Pet Dander, Odors, Pollen,2 Pack](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [2 Pack 211i Max Smokeblock Filters for Blue Pure 211i Max \| Air Puri-fier, Activate...](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [211i Max Replacement Filter for BLUEAIR Blue Pure 211i Max Air Purifier \| Ture HEPA & Activated Carbon Replacement Filter, 2 Pack](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [Blue Pure 311i+ Max AllergenBlock Replacement Filter Compatible with Blue Pure 311i...](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [Filter for Blueair Blue Pure Mini Max, Activated Carbon 4 Pack \| 2-in-1 activated c...](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [2 Packs 311i MAX Replacement Filter Compatible with Blue Pure 311i Max Air Purifier...](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [311i Max Replacement Filter for Blueair Blue Pure 311i Max Air Purifier \| 2-in-1 311i Max HEPA with Activated Carbon Air Filter, Blue Pure F3MAX, White, 2 Pack \(NOT for 311 & 311i+ Max\)](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)
- [Mini MAX AllergenBlock Replacement filter for Blue Pure Air Purifier \| H13 True HEP...](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)

## Add-ons

- [Mbetter 2 Pack 211i Max AllergenBlock Filters for Blue Pure 211i Max \| Air Puri-fier, Activated Carbon Filters, Replacement Part \#F2MAX](https://best-deals.pro/visit/mbetter-211i-max-replacement-filters-2-pack)
- [Mbetter 2 Pack 511i Max AllergenBlock Filters for Blue Pure 511i Max \| Air Puri-fier, Activated Carbon Filters, Replacement Part \#F5MAX](https://best-deals.pro/visit/mbetter-311i-max-allergenblock-replacement-filters-2-pack)

## Images

![Mbetter 311i Max AllergenBlock Replacement Filters, 2-Pack — 1](https://best-deals.pro/i/WFQ2FjGDoHtj7guzz64xshfZXhLcKJfeYzWYejQ_tLVSNX75W0-mdeNPJZK-ujACThk0QcnXK8nMZYyitUZyw_tt3RPPrpvRilGc0kvj9AtEgTjl4fq7DMGp.jpg)

![Mbetter 311i Max AllergenBlock Replacement Filters, 2-Pack — 2](https://best-deals.pro/i/ow3LklQR5Vk0sdKX6xYFC5Brj0MBVObOinj4U0_wZuSDjyXxx-PLo6YuhV3klnuFBJaS7UD9gbsSqHxjxrBoK6ftW_OFgYBO1BqM5MB9VLVYOJJPfDp4ca7x.jpg)

![Mbetter 311i Max AllergenBlock Replacement Filters, 2-Pack — 3](https://best-deals.pro/i/85bup0GbRElG_RVlwMhoVXuc8VA6RL8TnQ6ioZyMjPgP8fyqRPdBkuGWFQmne1KKaua7JW5GY5dciCk9QBRP_LiNZmVvU2emORQhNQ1jaWlcJkTSH1BpTD3P.jpg)

![Mbetter 311i Max AllergenBlock Replacement Filters, 2-Pack — 4](https://best-deals.pro/i/sQAXv1_Qzpbt5PWR_RCUMXlqQNP7qJ1tCzCJ4Z9hhBXyjHlRY7Nat2kCZbx7Z0aRh4LoiTCTWqjiH4QSXqesTSuJjqEUpm06Dwe59b9VynIbgRPad9MhAdlm.jpg)

![Mbetter 311i Max AllergenBlock Replacement Filters, 2-Pack — 5](https://best-deals.pro/i/UbXfFGfHZnIRdiGcp4cSagnN3pBi3jvOpGazo00SMrvQanYV65w-js7FW_FSHy8lrjfCSAb8C6T2VSGdY1x6U0uGLpngquUkVfgcwXcsQq4oJGtFZe8cN-if.jpg)