(G) Fire Door Keep Closed Sign
Fire doors are meant to prevent raging flames from reaching further into a building, as they're designed to reduce the speed that fire and smoke travels between areas. In order for them to work, they must remain closed, lest they open up and allow flames to escape. For this reason, it's imperative to install "Fire Door Keep Closed" signs on them, as they remind occupants not to prop them open. Another version of these signs state "Fire Door - Do Not Block," which are for fire doors that close automatically. Since they activate whenever the fire alarm is set off, they shouldn't be blocked so as to keep them working properly.
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