Why do insulation workers wear masks?


there bunch of them on @ house other day, wandering around masks on covered whole face. started freak out bit after while. how come need protection , don't. i've been exposed of stuff they're using have. don't know how these masks work. help?

there bunch of them on @ house other day, wandering around masks on covered whole face. started freak out bit after while. how come need protection , don't. i've been exposed of stuff they're using have. don't...


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