This Austin Air Replacement Filter Pack includes all 4 component filters that originally arrived with the Allergy Machine Air Purifier (HM405 series).  Replacement time frames can vary depending on whether the Allergy Machine is filtering heavy particles and gases, but typically, the replacement time period is approximately every five years. The pre-filters can be purchased separately if you prefer to replace these filters more often. When purchasing the Replacement Filter Pack or the pre-filters, select White replacements if your Austin Air purifier is White or Sandstone or Black replacements if your purifier is Black. The exterior layer of pre-filter can be seen through the air purifier’s grille and therefore, choose the replacement filter according to the color of your purifier. Although this Filter Replacement Pack is designed for the Allergy Machine, it will fit any Standard size Austin Air Purifier (such as the HealthMate or HealthMate Plus).  Junior Filter Packs sold separately.  

The Austin Air Allergy Machine features 4 stages of filtration, and each of these stages are included in the Filter Replacement: 

Stage 1: Large Particle Pre-filter removes particles such as dust, hair and pet dander

Stage 2: Medium Particle Pre-filter removes small to medium size particles such as molds, spores and pollen

Stage 3: 60 sq. ft. of True Medical Grade HEPA filtration removes 99.97% of all particles larger than 0.3 microns

Stage 4:  HEGA Filter with Activated Military Carbon Cloth removes chemicals, gases and odors

NOTE:  Austin Air products ship directly from the manufacturer and will arrive separately from any other products purchased from Allergy Partners. An additional Drop Ship fee of $30 will be added to your order.