**** This new thread will self-destruct in 48 hours **** There is an article on the web, suggesting that dust mask are ineffective at preventing the wearer ( caver ) from breathing in dust particles.
http://news.discovery.com/human/health/face-masks-provide-false-hope-against-pollution-140228.htm It does seem like cavers visiting very dusty caves, should wear breathing respirators, that have a rubber seal around the nose and mouth and replacable canisters. Especially if you are going to be sturrying up the dust by digging. http://nsprod.blob.core.windows.net/material/204294/400.jpg Unfortunately, those mask appear cumbersome and uncomfortable, especially when exerting yourself, sweating, etc. David Locklear --------------------------------------------------------------------- Visit our website: http://texascavers.com To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com For additional commands, e-mail: texascavers-h...@texascavers.com
