Filter Specifications 

• STAGE 1 – Large Particle Pre-filter. Removes particles easily seen by the naked eye (e.g. dust, hair and pet dander)
• STAGE 2 – Medium Particle Pre-filter. Removes small to medium size particles (e.g. molds, spores and pollen) Color: gray, blue or green
• STAGE 3 – Over 780 cubic inches of Activated Carbon and Zeolite Removes chemicals, gases and odors
• STAGE 4 – 60 sq. ft. of True Medical Grade HEPA. Removes 99.97% of all particles larger than 0.3 microns and 95% of all particles larger than 0.1 microns.
• STAGE 5 – Military Grade HEGA Carbon Cloth. HEGA (High Efficiency Gas Arrestance), providing an extremely large surface area for adsorption of chemicals, gases, viruses and bacteria

You can check the size of your existing filter by looking for a label on the underside. Model HM400 indicates standard size filter.

Which filter types fit my Austin Air purifier?

If your purifier was manufactured prior to 1996, you can only replace your filter with an Allergy Machine filter.  If your purifier was manufactured in 1996 or later, you can replace your filter with any filter type:  Allergy Machine, HealthMate, HealthMate Plus or Bedroom Machine. 

How did Austin Air determine their filters will last as long as five years?

The amount of carbon, the carbon bed thickness, and the amount of True Medical HEPA paper in our filters allows us to achieve a pro-rated five (5) year warranty.  Austin filters should last for five years in a normal household setting.

Why would a filter to need to be replaced in less than five years?

Using an Austin Air purifier in an area that has increased levels of airborne pollutants may cause a filter to be replaced in less than five years.   Indoor areas with many pets, new carpeting, paint fumes, heavy smoking, urban pollution, photo studio, etc. all can diminish a filter’s life.

How do I know when my filter needs to be replaced?

There are two indications that your filter needs to be replaced:

1. An unpleasant odor coming from the unit means that the carbon in the filter is full and the filter needs to be replaced, and
2. Significantly reduced airflow coming from the unit means that the HEPA filter is full and the filter needs to be replaced.