this post was submitted on 15 Nov 2023
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I don't think that's true anymore. It used to be the case in older types that the powder inside would clamp after some time but the new powders don't do it. You just have to make sure that the gas is still pressurized inside.
Every fire extinguisher we use at my workplace has to be recertified yearly, even the brand spanking new ones
Fire guy doing it has told me that even modern ones still can go bad from just sitting there for a year
I've just looked it up and as I've said: extinguisher can last up to 20 years and you only have to check the gas pressure and if there is any psychical damage. But I know that in old extinguishers the powder inside could clamp up and proper way to use it was to shake it first. Hasn't been the case for quite some time now.