How to Change a Blueair 311i Max Filter

On this page (7 sections)

1. How do you change a Blueair 311i Max filter?
2. How do you remove the old filter?
3. How do you install the replacement filter?
4. How do you reset the Blueair filter indicator?
5. Does the 311i Max fabric pre-filter need replacement?
6. What should you do if the replacement doesn't fit?
7. Which filter should you use for a different Blueair model?

To change a Blueair 311i Max filter, turn off and unplug the purifier, remove its cover and old filter, fit the correct replacement, then reset the filter indicator. Use the instructions for your exact model to confirm how its cover opens and how the reset control works.

The replacement named for this purifier is the BLUEAIR Genuine Blue Pure 311i Max Air Purifier Replacement Filter. Blueair says it fits the 311i Max, but not the 311i+ Max or 311 Auto, so check your model name before you start.

How do you change a Blueair 311i Max filter?

Unplug the purifier before opening it, then replace the main filter and reset the indicator after reassembly. Keep the new filter clean while you work, and follow the 311i Max manual for the cover and filter orientation.

1. Switch off the purifier and unplug it from the outlet.
2. Move it to a clear, dry work area and remove the outer fabric pre-filter if your unit has one.
3. Open the main filter compartment as shown in the manual.
4. Lift out the used main filter and place it in a bag for disposal.
5. Check the compartment for loose dust and wipe it with a dry cloth if needed.
6. Install the new filter in the position and direction shown in the manual.
7. Close the compartment, put the fabric pre-filter back if applicable, and plug in the purifier.
8. Use the model's filter reset procedure after the replacement is installed.

Don't force the cover or filter. If the new filter does not sit in place, stop and check that you have the right filter and that the compartment is open as intended.

What should you check before opening the purifier?

Confirm that the purifier is a Blue Pure 311i Max and that the replacement is made for that model. The 311i Max filter is not interchangeable with every Blueair filter.

The BLUEAIR Genuine Blue Pure 311i Max replacement filter is designed for this purifier. Blueair states it is not compatible with the 311i+ Max or 311 Auto, so compare the full model name on your unit before buying.

Gather a dry cloth and a bag for the used filter before unplugging the unit. Keep the new filter wrapped until you're ready to install it, and avoid touching its filter material.

How do you remove the old filter?

Open the compartment using the steps in the 311i Max manual, then lift the old filter out without shaking it. A bag nearby makes it easier to contain dust from the used filter.

The exact cover movement can depend on the purifier's design, so follow the manual instead of prying at seams or catches. Set the cover on a clean surface where it won't collect dust.

If the unit has a fabric pre-filter, remove it gently and set it aside. The fabric pre-filter is separate from the main filter and may need its own care.

Bag the used filter and follow local household waste guidance. Don't vacuum or wash the main filter as a way to extend its use unless Blueair's instructions for your exact filter explicitly allow it.

How do you install the replacement filter?

Place the replacement in the compartment in the orientation shown in the manual, then close the purifier securely. It should sit evenly without being compressed or forced.

The BLUEAIR Genuine Blue Pure 311i Max filter is made for the 311i Max. Check its model compatibility before opening the package, especially if you own a 311i+ Max, since Blueair identifies that as a different model.

The BLUEAIR Genuine 411 Series filter is for the Blue Pure 411, 411 Auto, and 411+, not the 311i Max. Don't use it as a substitute; product names can look similar while the compatible purifier models differ.

After the main filter is in place, reinstall any fabric pre-filter and the outer cover as directed. Check that the parts sit normally before reconnecting power.

How do you reset the Blueair filter indicator?

Reset the indicator only after the replacement filter is installed and the purifier is fully reassembled. Follow the reset sequence in the 311i Max manual, since control steps can vary by model.

The indicator helps signal when the main filter needs replacement. If it remains on after the reset procedure, check that the filter is seated and the cover is closed, then repeat the manual's steps.

Don't assume that switching the purifier off and on resets the indicator. Avoid trying button combinations from another Blueair model, since they may not apply to the 311i Max.

Does the 311i Max fabric pre-filter need replacement?

A removable fabric pre-filter is a separate part from the main filter. If your 311i Max has one, follow Blueair's care instructions for that fabric rather than treating it like the main filter.

The BLUEAIR Genuine 211i Max Air Purifier Washable Pre-Filter is made for the 211i Max, not the 311i Max. Blueair describes that fabric pre-filter as removable, washable, and reusable; it does not fit the 311i Max main-filter compartment.

For a smaller Blueair model, see our guide to Blueair Mini Max replacement filters. Match the replacement to the exact purifier model before ordering.

What should you do if the replacement doesn't fit?

Stop if the filter won't sit evenly or the cover won't close. Check the purifier's model name, the replacement's compatibility, and the filter orientation in the manual.

Don't trim, bend, or compress a filter to make it fit. If the model and filter appear to match but the compartment still won't close, contact Blueair support for model-specific guidance.

Keep the purifier unplugged while checking the compartment. Once the correct filter is seated and the cover closes normally, reconnect the unit and reset the indicator as instructed.

Which filter should you use for a different Blueair model?

Choose a filter by the full model name on your purifier, not by brand alone. Blueair makes replacements for different models, and compatibility does not carry across the product line.

For the larger 211i Max, see our best Blueair 211i Max replacement filter guide. For a different brand's reusable-filter system, our overview of the best Shark NeverChange air purifier filter covers that separate setup.

If you have the 311i Max, use the replacement specified for it, install it according to the manual, and reset the indicator only after the purifier is closed. For another Blueair model, check its exact compatibility before buying or installing a filter.

Frequently asked questions

How often should you change a Blueair 311i Max filter?

Change the main filter when the purifier's indicator signals replacement, and follow the current Blueair manual for your model. Replacement timing can depend on use and air conditions.

The 311i Max replacement filter is designed for that model; don't assume filters for other Blueair purifiers will fit.

Which filter fits the Blueair 311i Max?

The BLUEAIR Genuine Blue Pure 311i Max Air Purifier Replacement Filter is designed for the Blue Pure 311i Max. Blueair says it isn't compatible with the Blue Pure 311i+ Max or 311 Auto, so check the exact model name before ordering.

How do you reset a Blueair 311i Max filter indicator?

After replacing the main filter and reassembling the purifier, use the filter reset procedure in the 311i Max manual. The button or control sequence can vary by model, so follow the instructions for your unit instead of guessing or resetting before the new filter is installed.

Can you wash a Blueair 311i Max main filter?

Don't wash the main filter unless Blueair's instructions for your exact filter say to do so. The washable item described here is a fabric pre-filter for the 211i Max, which is a different part for a different model; it doesn't replace the 311i Max main filter.