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. 2021 Jan 20;2:26–35. doi: 10.1109/OJEMB.2021.3053215

Table 4. Maximum Distance Travelled by Jets for Different Masks (95% CI < Inline graphic2 cm).

Crown Side Back
Mask Flow Test Frame Dist. (cm) Flow Test Frame Dist. (cm) Flow Test Frame Dist. (cm)
surgical heavy 99 45 >22 heavy 116 102 19 Inline graphic 2 heavy 99 95 >19
FFP1 cough 257 64 >17 cough 264 146 16 Inline graphic 2 not discernible
FFP2 cough 258 74 >19 cough 265 225 14 Inline graphic 2 not discernible
handmade heavy 106 35 >22 cough 266 139 18 Inline graphic 2 quiet 105 195 >18
respirator cough 260 57 >11 not discernible not discernible
heavy-duty commercial face shield cough 261 70 >26 heavy 128 66 18 Inline graphic 2 heavy 110 70 >20
UoE lightweight 3DP face shield + opaque cover cough 262 80 >10 cough 269 92 8 Inline graphic 2 heavy 134 90 >15