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Table 3 Quantitative fit testing results using mask frames

From: 3D Printed frames to enable reuse and improve the fit of N95 and KN95 respirators

Performance of frames with respirators with broken or defective straps

Mask type

Fit factor with control mask

Fit factor with mask frame on respirator with broken or defective straps

1860 model

185

200+

1860 model

13

9

8210 model

17

19

Performance of frames for individuals who failed baseline testing

Mask type

Fit factor with control mask

Fit factor with mask frame on respirator that failed baseline testing

1860 model

56

200+

8210 model

0

200+

KN95 model

0

101

KN95 model

0

6

  1. Testing was performed on previously used and sterilized respirators due to supply shortages in the setting of the COVID-19 pandemic. Control testing was performed for each respirator without the mask frame but with the use of functional straps. A fit factor of 100 is considered a passing value