As an Amazon Associate I earn from qualifying purchases.Updated: March 19, 2026
The HEPA filter in your Blueair 311 Auto is crucial for capturing airborne pollutants like dust, pollen, pet dander, and mold spores. Over time, these particles accumulate on the filter, reducing its effectiveness. Replacing the HEPA filter regularly ensures your air purifier continues to function optimally and provide clean air. Delaying replacement can lead to reduced performance and potentially allow harmful particles back into your environment.
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Function: Traps microscopic airborne pollutants like dust mites, pollen, pet dander, mold spores, and smoke
Signs it needs replacing: Reduced airflow from the unit, increased noise levels during operation, noticeable dust accumulation on the filter surface
OEM vs aftermarket: OEM filters guarantee compatibility and performance but are usually more expensive. Aftermarket filters offer a cost-effective alternative, but be sure to verify compatibility with your specific model (BPA300) before purchasing.
Installation: Typically involves simply removing the old filter and inserting the new one according to the instructions provided in your Blueair 311 Auto manual.
Replacement schedule: every 12 months
Compatibility warning: Always verify part number BP-311-RF matches your exact model before ordering
Pros & Cons
Pros
✓ Restores device to original performance without buying a new unit
✓ Significantly cheaper than a full device replacement
✓ Multiple options available from OEM and aftermarket sellers
Cons
✗ OEM parts cost more than third-party alternatives
✗ Wrong part number will not fit — model verification is essential
Common Use Cases
Scheduled maintenance: replacing on the every 12 months schedule
Performance restoration after noticing reduced output or efficiency
Preventive replacement before a worn part causes secondary damage
Who Should Buy This
This replacement HEPA filter is for Blueair 311 Auto owners whose device is no longer performing as effectively as it used to. Replacing the worn filter can restore your air purifier to its original efficiency.
Not ideal for: If your Blueair 311 Auto is experiencing mechanical issues beyond a worn HEPA filter, or if it's very old and has sustained significant wear, a full replacement might be more cost-effective than repairing.
Good to Know Before Buying
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Always confirm your exact model number (BPA300) before ordering. Part numbers vary between model variants and production years. Check the label on your device or original documentation to be sure.
Frequently Asked Questions
What is the part number for the Blueair 311 Auto HEPA Filter?
The part number is BP-311-RF. Always verify this matches your exact model (BPA300) before ordering, as similar models may use different parts.
How often should I replace the HEPA Filter on my Blueair 311 Auto?
every 12 months
Will aftermarket HEPA Filter replacements work in my Blueair 311 Auto?
Third-party parts are widely available and often cheaper than OEM. Look for listings that specifically mention compatibility with model BPA300 and check buyer reviews for fit confirmation before purchasing.
Prices change frequently. See the latest deal on Amazon.