Replacement Filter D for the Guardian Technologies germguardian Table Top Air Cleaning System (Model No. AC4220).

This True HEPA combination filter incorporates multiple layers of filtration including True HEPA and charcoal to help improve indoor air quality.
It is recommended that the filter be replaced every 6-8 months, depending upon use.
Specifications
Model No.: FLT4220
Replacement Filter for: AC4220 Table Top Air Cleaning System
Combination Filter: True HEPA and charcoal