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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