[Ben’s] build goes above and beyond the usual craft project masks. It uses a laser-cut chipboard frame to fit three HEPA filters, originally designed for the Roomba robotic vacuum cleaner.

Description: This air mask provides uniquely versatile protection, transforming quickly from a CBRN self-contained breathing apparatus to either an air-purifying respirator (APR) or a powered ...

The masks use three layers of filtration to filter out at least 95% of all non-oil-based airborne particles. These 3M face masks, meantime, are also NIOSH-approved and are used to help filter out ...