All standard-sized Austin Air units are compatible with any of the standard-sized filters. This means that if you originally bought a HealthMate® unit and are looking to upgrade to a Bedroom Machine®, you can simply purchase a replacement Austin Air Bedroom Machine Filter and it will fit seamlessly into your existing unit.

When ordering your replacement filter, it's crucial to double-check both the size and type of filter you need before finalizing your purchase. Mistakes in ordering the wrong filter could result in a restocking fee if you need to return it.

To determine the size of your current filter, look for a label on the bottom of your air purifier. If the label shows "Model HM400," then your unit uses the standard sized air filter.