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The main filter for the HM400 air purifier is an integrated system incorporating a medical grade HEPA filter along with fifteen pounds of activated carbon and zeolite. This is a large filter which can remove both particulate and odors for up to five years depending on the amount of pollution in the air.  The main filter includes a pre-filter so there is no need to order both when you need a main filter.  A new air purifier comes with the filters. These are replacements.  (For heavier odors, select an HM450 filter. The HM400 main filter and the HM450 main filter are interchangeable in an air purifier.  If you order an HM400 air purifier and want to increase its ability to remove odors and chemicals, you can replace the HM400 filter with an HM450 filter.)

The HM400 is ClearFlite Part No. 8002. Austin Air Model FR400B

This main filter works in both 110volt and 220volt units