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In many cases, especially for the higher end models, you can spend in the neighborhood of $100 to get an Rx face-shield. On the note of matters that didn't seem to come up much in the article, but that I feel like people should know:

The kind of cartridge you need to withstand teargas is not an N95, as the top comment points out it's quite a bit more involved. The downside of that other than cost and duration of the filter is that you'll feel a lot more resistance on inhaling than you're used to. For some people the combination of something on their face and the feeling of restricted breathing is unbearable, and mid-tear gas attack is a terrible time to realize that.

Consider also that this becomes far more important if you're working hard, say running around or fighting. Anyone who has it in their head to give this a try should keep those factors in mind, as well as get a kit to properly fit-test because again... mid-attack is a terrible time to realize that your fit isn't up to snuff. Likewise with training to don and doff.

In a lot of ways the article feels like clickbait that's extremely self-aware, but not really concerned with the practical reality of what they're implying.

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Honestly the 3M 60923 cartridges don't restrict breathing at all. They have great airflow. I've used them all day long in chemical plants, no one complains about that.
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Seconded. I've used those exact cartridges. Not for as long of shifts as you, but I'd say the face mask fit is much more important for that.

My DIY-perspective tip is that when you're getting to know the respirator, you can take the filter cartridges off and put your hands over the input ports to feel what fully restricted breathing feels like, make it a known sensation in case it ends up happening. Likewise you can cover the output port and breathe out to do a kind of rough fit test.

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I save my hotel key cards and keep a few of them in each of the safety cabinets and kits.

You can hold up a key card to cover each bayonet filter and it seals it perfectly for a quick test at any time.

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I usually put those in a parts drawer for use when opening electronic devices built with clipped together plastic cases.

Good tip, though! I'll have to try that next time I'm using the bayonets.

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Fantastic fit-test tip.
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Thirding this. I can wear one all day in hot weather with a half mask on climbing ladders. I did this to paint my house during fire season one year.
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There is a glasses kit available for the listed 3M 6800.

https://www.3m.com/3M/en_US/p/d/v101296043/

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Just how big are your glasses? These aren't goggles that try to seal around your eye sockets, they are shields that seal around your face, sitting in front of your face by an inch or two. If you're worried about the glasses temple breaking the seal, it's still going to provide the vast majority of benefit.
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Yes, in addition to inserts which are custom to the mask, there are small frames with a thin rubber band to keep them on you. They were great for roughhousing occasions as well as under mask. The key part is the thinness and impermeability of the band allows for a good seal.

https://eyeglass.com/products/criss-optical-collection-mag-1...

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As someone with big bulky eye glass lenses and frames I looked up the solution for the CM-6 derived masks, https://www.rigad.com/avec-spectacle-insert-for-cm-6-masks. Sounds like you'd have to get new lenses just for it and put 'em in, and the field of view is not great, but it is feasible.
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