IOYIJOI Filter Replacement Kit for Holmes Aer1 Series — 4 Filters + 8 Booster Pre-Filters (HAPF300AH-U4R, HAP242-NUC)

Keep your Holmes and Bionaire air purifiers performing at their best with the IOYIJOI Filter Replacement Kit. This thoughtfully designed set brings together a four-filter core and eight booster pre-filters, so you can maintain efficient filtration and steady airflow between full replacements. The kit is built to fit Aer1-ready models and to replace the A, D, and K filter families, offering flexibility for different units in your home.

The IOYIJOI kit embraces practical details you’ll notice in daily use. The four replacement filters catch larger particles and help preserve the purifier’s filtration system, while the eight booster pre-filters provide an extra layer of defense against common household dust and odors. With spare filters included, you can rotate changes to suit your schedule and keep your purifier ready for action whenever you need it.

Compatibility at a glance

• Holmes Aer1 ready models — CAP531-U, CAP529-U, HAP240, HAP242, HAP412, HAP422, HAP424, HAP706, HAP716, HAP9240, HAP9242, HAP9412, HAP9414, HAP9422, HAP9424
• Bionaire units — BAP260, BAP815, BAP825, BAP9200, BAP9700, BAP520

How to use

For best results, replace the core filters on schedule based on your purifier’s usage. The booster pre-filters help maintain airflow and reduce the load on the main filters, potentially extending their life and keeping operation smooth.

Why IOYIJOI

• Spare filter included for easy rotation
• Designed to fit Aer1 ready models and replace A, D, K filter families
• Responsive support if you have questions or issues

Note: If you’re not fully satisfied with your IOYIJOI replacement kit, contact us and we’ll resolve the issue quickly. Our aim is helpful, no-pressure support for your home setup.

In real life, replacing filters with this kit can help keep surfaces free of dust with less effort; you may notice easier breathing in a busy living room, a quieter night when the purifier runs, and a more consistent impression of clean air in your home or office.