Two Plus Four Pack True Post Filter Replacement For Holmes AER1 And Bionaire Purifiers HAPF300AH U4R Plug And Play Premium Grade Filter Compatible With CAP531-U CAP529-U HAP240 HAP242 HAP412 HAP424 HAP702 HAP706 HAP716 BAP260 BAP815

2+4 Pack Post Filter Replacement for AER1 Purifiers
✔️ 2+4 pack post filter for HAPF300AH-U4R and CAP531-U

This post filter replacement is designed for air purifiers in the Holmes AER1 and Bionaire lines, helping maintain clean air by substituting worn filters with no tools required. It supports plug-and-play installation and is compatible with multiple unit models.

✅ Captures 99.97% of particles down to 0.3 microns
✅ Activated carbon layer absorbs smoke, odors, and cooking smells
✅ FSC-certified paper construction
✅ Easy, tool-free installation
✅ Pack size 2+4 ships as replacement for HAPF300AH-U4R and associated CAP/HAP series

💡 What is a post filter used for in home air purifiers? A quick, handy explanation follows. - It traps larger particles before the main filter to extend life of the primary filter
- The carbon layer helps cut odors, smoke and cooking smells
- It’s designed for easy replacement every 2-3 months to maintain peak performance