All standard size units are interchangeable with all standard size filters. So, if you purchased a standard size unit, simply purchase the standard size replacement filter that suits your needs best. You can check the size of your existing filter by looking for a label on the underside. Model HM400 indicates standard size filter.
5-Year Pro-rated Filter Warranty
Austin Air offers a 5-year pro-rated filter warranty, by far the most comprehensive in the industry. No more costly filter replacements every few months or years. Austin Air filters are designed to last for an unprecedented 5-years, under normal residential use.
Prefilter and 5-year HEPA filter included.
- Capital Air Filters is an Authorized Austin Air Distributor -