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I used to use disposables - but my powered respirator whilst expensive is a lot better. Cheaper than new lungs...
Not quite disposable but certainly reusable the Dust Bee Gone masks may be of interest George. Turner's retreat stock them I believe. Full details at http://www.dustbeegone.com/dustmask.htmlNo substitute for a powered respirator for heavy dust conditions but you can talk through them, they fit well over the bridge of your nose and tend not to steam up safety glasses. You can wash them too. Sorry I can't offer suggestions for true disposable masks for students, I provide powered respirators.Cheers Rick