Perfect Compatibility: Our 211+ replacement filters are perfectly Compatible with Blue Pure 211+ and 211+ Auto Air Purifier. The advanced filter ensures consistent and reliable performance. Please confirm your machine model before order, thank you. The H13 True Filter: This Blue Pure 211+ Filter combined with high efficiency 2-stage filtration system, the front filter absorbs pet plush and life debris. The H13 True filter are capable of attaching 99.97% of airborne particles as small as 0.1 microns, Activated carbon filter helps you solve the problem of unpleasant odors, such as cooking smells, smoke, pet odors and VOCs. Premium Quality: The filter is made of high quality non-woven fabric, constructed with premium h13 / MERV 17 to greatly improve the performance of your filter..We use advanced low-energy, low-density construction technology for higher efficiency and lower pressure to ensure maximum filtration and maximise the life of your 211+ air filter. Replace Regular: Package includes 2 Pack Blue Pure 211+ Air Filters to meet your needs for different occasion. To maintain your Blue Pure 211+ air purifier filter at peak performance, we recommend you to replace your 211+ filter every 6-8 months (Depending on your usage and environment). It is extremely convenient to install the 211+ air filter, no tools required. Simply take out and replace from your machine unit when needed. Customer Service: Our customer service team is available 24/7 and will respond to your message within 24 hours. If you have any problems with your filter, please contact us via email. Please rest assured that we will solve all problems for you. 2 Pack 211+ Filter Replacement Compatible with Blue Pure 211+ Air Purifier, 2-Stage Filtration System of H13 True Filter & Activated Carbon Filter