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GumbyCT wrote:It filters out the dust that used to irritate my nose. But because of this my body no longer adjusts to the foreign particles.

In a good way or bad way, GumbyCT? Do you mean you have worse reactions to the dust when you do encounter it, or less reactions?

I had to enter a confined space with no fresh air and spray an insulation on the inside. With the machine outside to provide air, a nasal mask and ten hoses connected together, the job got done.