The Honeywell HW180 has been discontinued. The Holmes H200 is a suitable replacement part.
The HW180 is a compatible replacement for the Honeywell 16180 Plug & Clean Air Filters 3-Pack. These air filters for air purifiers arrive in a 3 pack and fit all Honeywell Plug & Clean 16180 models. These filters also fit the Hamilton Beach 04251, Holmes HAP201U, Holmes HAP201-U, and Holmes HAP-201-U.
These replacement filters are specially designed to help remove unpleasant odors from the home, including from such sources as the kitchen, bathroom, baby's room, pet area, tobacco, basements, and attics. For best results change the filter continually as it will allow your air purifier to operate at a higher quality.