I use a half mask most of the time, but when I have cut coco, the few times I have,
I use this one. It also works well to protect the eyes, (been to the ER a few times after cutting stuff). Just can't wear glasses though.
I've been using the 3M masks for years. I think I have the 7500. I can't remember the filter #s but i am pretty sure they are the HEPA filters. Whatever they are, I spent some time researching and bought the ones that block the finest particles. Joe is using the better cloth filters but I still think they are inadequate. I like the way my mask seals around my face. I can't say its a pleasure to wear but its fairly comfortable and when I blow my nose at the end of the day it doesn't look like I'm a Coalminer.