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Frame to Improve the Fit of N95 Filtering Face Mask Respirators
Daniel Stemen1, Marshall Ge, Darryl Hwang
1Department of Respiratory and Interventional Pulmonology, Keck Medical Center of the University of Southern California (Mr Stemen); Caruso Department of Otolaryngology-Head and Neck Surgery (Dr Ge, Dr Ference); Department of Radiology (Dr Hwang); Department of Biomedical Engineering, Viterbi School of Engineering of the University of Southern California (Dr Hwang); Tetra Bio Distributed (Mr Qaddoumi, Dr Roden; Section of Infectious Disease, Department of Medicine (Dr Nanda), Keck School of Medicine of the University of Southern California, Los Angeles, California.
Objective:
Test a device that can improve upon the seal of filtering face mask respirators (FFRs).
Methods:
A 3-D prototype for a fit improvement frame (FIF) was created and quantitative fit testing was performed for FFRs with and without the FIF.
Results:
Thirty eight volunteers underwent fit testing. The overall fit pass rate was 100% for the 3M model 1860 masks, 50% for the 3M model 8511 masks, 13% for the BYD CARE model DE2322, and 7% for the Honeywell DC300N95. When using the FIF the overall passing rate increase to 87% for the DE2322 + FIF (P < 0.01) and for the DC300N95 + FIF the passing rate increase to 73% (P < 0.01).
Conclusion:
The FIF is effective in improving the mask fit of a common flat fold N95 masks and potentially other N95 masks.
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