Check the listing for details. Filter Queen Defender 4000 Series Replacement HEPA + Carbon Pre-Filters Bundle. Color: White and Black, Condition: New. Listed at 164.99 USD. Filter Queen Defender 4000 Series Replacement HEPA + Carbon Pre-Filters Bundle -Bundle & Save - Bundle Includes: (2) HEPA 13 Filter and (6) Carbon Pre-filters. Breathe Naturally offers premium quality HEPA and carbon pre-filters at a fraction of the cost compared to other original equipment Manufacturer (OEM) brands. -Direct Replacement for Filter Queen Defender 4000 Series Air Purifiers. Compatible with: Filter Queen Defender 4000, Rac4000, AM4000, Defender 360, Defender 7500, 5404011300 and 4404009100 series air purifiers. -MERV 17/ HEPA 13 Filters - HEPA filters specially designed to trap dust, and other airborne particles from the air. Traps particles down to 0.3 microns at a 99.97% efficiency level. Perfect for those who suffer from allergies, asthma, or anyone who just wants to Breathe Naturally. -100% Money Back Guarantee - As a Minnesota family-owned operation, we’re so confident you will love our HEPA 13 filters and carbon pre-filters, that we offer a satisfaction guarantee or your money back. No questions asked. -We recommend changing your HEPA 13 filters every 4-6 months and your carbon pre-filters every 1-2 months based on use.