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.
replyMy 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.
I save my hotel key cards and keep a few of them in each of the safety cabinets and kits.
replyYou can hold up a key card to cover each bayonet filter and it seals it perfectly for a quick test at any time.
I usually put those in a parts drawer for use when opening electronic devices built with clipped together plastic cases.
replyGood tip, though! I'll have to try that next time I'm using the bayonets.
Fantastic fit-test tip.
replyThirding 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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