Do you open or close them when you’re wearing them?

Neither. They don’t open or close. They are a filter that allows air in when you breath but not when you breath out.

How often do the filters need to be changed?

I change mine about every 5-7 days depending how much use

Are you open or close them when you’re wearing them?

Close them to lock the filter in place

How well do these work with glasses? Fog up or no?

This mask is much better for me than the cloth masks. With normal breathing, my glasses don’t fog up. With harder breathing glasses fog a bit

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