Fit factor change on quantitative fit testing of duckbill n95 respirators with the use of safety goggles

Moira Johns, Sandy Kyaw, Rimen Lim, Warren C. Stewart, Solomon R. Thambiraj, Yahya Shehabi, David W. Collins, Claudia M. Whyte, Sumesh Arora

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)


N95 respirators and safety goggles are important components of personal protective equipment to reduce the spread of airborne infections, such as COVID-19, among healthcare workers. Poor N95 respirator seal may reduce its protective effect, thereby increasing transmission. Quantitative fit testing is an established way of assessing the N95 respirator fit, which provides a quantitative measure for seal, called the fit factor. Duckbill N95 respirators frequently fail the fit test. We hypothesized that using safety goggles with a wraparound elastic headband will increase their fit-factor by reinforcing the seal between the face and the upper margin of the respirator. We studied the effect of safety goggles with a wraparound elastic headband (3M™ Chemical Splash Resistant Goggles, ID 70006982741) on the fit factor of two types of Duckbill N95 respirators (Halyard FLUIDSHIELD*3, Model 99SA070M, and ProShield® N95 Model TN01-11) in 63 healthy volunteers in a nonrandomized, before-and-after intervention study design. The mean fit factor increased from 69.4 to 169.1 increased from 17/63 (27%) to 46/63 (73%) after the intervention (p <0.0001, OR 3 [95% CI = 4.9–1223]). This is the first study to explore the impact of safety goggles on N95 respirator fit. We conclude that the use of safety goggles with a wraparound elastic headband increases the fit factor of the tested Duckbill N95 respirators.

Original languageEnglish
Pages (from-to)981-986
Number of pages6
JournalIndian Journal of Critical Care Medicine
Issue number9
Publication statusPublished - Sept 2021
Externally publishedYes


  • Eyeglasses
  • HCW (Healthcare workers)
  • Infectious diseases
  • Intensive care
  • N95 MASK
  • N95 respirators
  • Occupational injury
  • Personal protective equipment
  • Safety

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