How to make a Face Mask Filter with HEPA Fabric - video ...
May 02, 2020·The filter media in a Filtrete brand filter performs very differently than an approved N95 respirator or mask. It cannot achieve the fit or performance of a mask or N95 respirator and modifying the furnace filter may damage the material. 3M does not recommend or support the use of a Filtrete brand filter to make a mask or respirator.”