1、Using carbon cotton filter, it can filter hair, fine dust particles, respirable particles, chemical substances, etc. 2、The air inlet uses a high-density filter to easily filter dust and prevent secondary pollution. 3、Simple installation and replacement method, can be perfectly fit for Holmes Aer1 HAPF30AT air purifier. 4、Help to remove a lot of air pollutant, improve air quality, and create a clean living environment for you. 5、Exquisite workmanship and stable performance can effectively improve the performance of the air purifier. 1 x Air Purifier Filter1 x Carbon Cotton Condition: 100% Brand NewItem Type: Air Purifier FilterMaterial: Filter, Carbon cottonFunction: Filter hair, fine dust particles, filter pm 2.5Weight: Approx. 190g / 6.7ozProduct Size:Purifier Filter: Approx. 25.5x 12.8x3cm / 10.0x 5.0x 1.2in Carbon Cotton: Approx. 24x 10.8cm / 9.4x 4.3inApplicable Model: Fit for Holmes Aer1 HAPF30AT Purifier