Bill of materials (single piece)

Mask cloth: 3 A4 sheets (210x297mm) – cotton or breathable polycotton, bedding or shirt weight
Filter: 1 A4 sheet – polar fleece, flieselin, nonwoven filter fabric, molton, kitchen ventilator filter a.s.o.
Electric cable, coated, 10 gauge (2,5mm²), length 7cm (3+1/4”)
2x elastic cord, 2-3mm (1/16-1/8’’) length 350mm (14”) (or flat elastic equivalent)
Flatbed lockstitch machine, size #60-80 thread, ¼” foot

Bill of materials (CAD production)

Cotton cloth: 1000x1500mm (39,5×59’’) / 15 products
Filter: 1000x1500mm (39,5×59’’) / 46 products
Electric cable, coated, 10 gauge (2,5mm²), length 7cm (3+1/4”): 1/mask
Elastic cord, 2-3mm (1/16-1/8’’) length 350mm (14”) (or flat elastic equivalent): 2/mask
Flatbed lockstitch machine, size #60-80 thread, ¼” foot