These filters are made to fit our adult sized face masks and can easily be cut down to our child sized face masks.
If you would prefer to make your own filter inserts, here is our tutorial: filter tutorial
Filter inserts are broken down MERV 12 rated furnace filters. These provide an additional layer of filtering to cloth masks. Filter is to be used between fabric layers by inserting through the pocket in the top of the mask.
LEGAL DISCLAIMER: The device created as part of this publication should NOT be used as a replacement for conventional and approved Personal Protective Equipment (“PPE”). The device has not been industry tested nor has it been NIOSH approved. The decision to use this device is solely your own.
We emphasize that this filter has not been assessed for its comparative efficacy to prevent nosocomial infection in health care workers compared with the standard-of-care, the N-95 mask.
THE AUTHORS, THEIR AFFILIATES, AND THE LITTLE DESIGN CO LLC DISCLAIM ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING THOSE OF QUALITY, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR INFRINGEMENT, AND WILL NOT BE LIABLE FOR ANY LOSSES OR DAMAGES IN CONNECTION WITH THE USE OF THE DEVICE DESCRIBED HEREIN.