this post was submitted on 24 Apr 2025
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As others have said, these are NFPA signs.
What I want to know is why there are two different ones. What the hell does that mean?
Two different chemicals to be aware of
But it's just slapped on the side of the building with no indication of which chemicals the labels are for, I don't think that's how it's supposed to be done. It'd be like mixing two chemicals into a bottle and then putting two labels on it.
I think there should just be one label that combines the warning levels of both i.e. 3-2-2-W
You have good instincts - that's also what NFPA recommends. This isn't a typical presentation as usually it's one diamond with the worst score of all present chemicals in each category.
You CAN list them individually but it's a pain in the ass for both the building owner and first responders. The whole point is to quickly convey the level of hazards in the building for emergencies. They need to know if they need more information before entering. 2+ diamonds doesn't provide any additional useful data and makes it harder to interpret in a rush.