The results show that 4 out of 7 participants were unable to achieve a proper fit from any of the tested N95 respirators.
This study also found that without proper fit, the value of high filtration material significantly decreases. Participants were seen to achieve similar protection from a fabric face covering as from a KN95 respirator, whose material should perform similarly to an N95 respirator. Indeed, our results indicated that surgical masks, poorly fit KN95 respirators, and basic fabric face coverings offered similar levels of protection to the wearer.
This implies significant reduction as in a separate study:
