North by Honeywell N99 SAF-T-FIT Plus N1139 Large Premium Disposable Particulate Respirator With Blue Nose Ridge comes with an exhalation valve that eases breathing and offers exceptional comfort during extended wear. It provides 99% efficiency against oil-free particulates and is excellent for general industrial, welding, soldering, metal cutting, metal pouring, torch cutting and other high temperature or dusty operations. Respirator is latex-free and offers N99 protection combined with a full sealing flange for the best fit and protection available.