The masks were used in cattle and hog facilities, while mixing feed and scooping grain, and at harvest while combining soybeans. Read Betsy's article to see which masks the testers liked best, and where you can buy them. Thumbs down from all farmer testers. No, you complete the job unprotected. The mask loses form very quickly and lets some dust through, reports Kenneth Schuster.
Exhale valve lets moist exhaled air escape fast so inside of masks stays dryer.
Kenneth Schuster says this mask and the 3M 8233 did the best job of keeping the dust out and were easiest to breathe through. They also held their form better than the rest. Matt Hays says this mask was comfortable and fit fairly well, but he preferred the 3M 8233. Matt Hays says this mask was the worst of the 3M masks as far as providing a good snug fit and filtering the dust. Has thin layer of activated charcoal to help remove livestock odors.