Custom-fit reusable respiratory protective device

A respiratory protective apparatus comprising:

• a frame that is reusable and configured to couple to and maintain a breathable filter covering over a facial region of a face of a user, wherein the frame and a contour thereof is configured to extend over both upper-cheek regions of the user, over both mid-cheek regions of the user, and a chin region of the user such that the frame maintains a continuous fit with the user's face throughout use and during a plurality of facial movements,
• wherein the frame and the contour thereof is customized, using a taxonomy model, to a scanned facial profile of the user, wherein the frame matches the taxonomy model having both a plurality of anthropometric landmarks as well as a plurality of mathematically determined landmarks that are derived by projecting the plurality of anthropometric landmarks onto 2D planes to determine intermediate process landmarks, wherein the frame is customized per the user and extends over (i) the plurality of anthropometric landmarks, including an infraorbitale and a zygomatic, and (ii) the plurality of mathematically determined landmarks, including a face side point, an upper a jaw side point, and a lower jaw point.