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Do you have a fire extinguisher on hand?
(lemmy.nz)
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this post was submitted on 15 Nov 2023
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You can't really test a fire extinguisher as it loses pressure when you discharge it.
As I pointed out in another comment, leaving them untouched and not turning them over to get the dust inside the can moving around and not stuck settled at the bottom is a real issue. To "test" them you basically ensure that the pressure is still where it needs to be and turn them over to get stuff unstuck from the bottom. That's all I was referring to.
The fact that no one has touched them in two and a half years leads me to believe that all the dust is settled at the bottom of the extinguisher, and when an emergency arises, they won't function properly.