Check the listing for details. Box of 60 - New HAPF300AH HEPA Air Filter Replace for Holmes & Bionaire $750 Val. Color: Green, Condition: New. Listed at 99.74 USD. 60 Brand New HAPF300AH HEPA Air Filter Replacement for most models of Holmes & Bionaire Air Purifiers, each box contains 30 units each unit has 2 brand new HAPF300AH filters and 4 carbon pre filters in each of the 30 individual units (boxes inside), each unit retails for $25 each brand new for a total retail value of $750. HAPF300AH Replacement Filter Decsription Compatible Models: Compatible with Holmes Units: CAP531-U, CAP529-U, HAP240, HAP242, HAP412, HAP422, HAP424, HAP706, HAP716, HAP9240, HAP9242, HAP9412, HAP9414, HAP9422, HAP9424. Compatible with Bionaire Units: BAP260, BAP815, BAP825, BAP9200, BAP9700, BAP520. Effective Filtering: Replaces Filter A, Filter D, Filter K. Premium Quality: AER1 Remover Filters are manufactured under strict quality control, specially designed with advanced nano molecular sieve filtration technology, the filtration effect is longer lasting, and has a stronger filtration effect on ultrafine suspended matter. Provides smooth and powerful airflow to bring fresh air to your family. Dual Filtration: HAPF300AH filters are effectively combined with external H13 layer + internal premium activated carbon layer. The H13 grade true HEPA filter can capture 99.97% of the particles in the air as small as 0.3 microns. Activated carbon filters are highly absorbent of odors, smoke, etc., which does not re-release particles or odors into the air. Replacement of filters: It is best to replace the filter at least once every 3 - 4 months. The details will vary according to the frequency of use. Before installing the filter, it is best to unplug the power supply. Each Package Unit (30 per box) includes 2 HEPA, 4 activated carbon pre-filter