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What is Staircase Pressurization Systems Explained about?

Buildings of 3 stories or more must have automatic pressurization systems to prevent smoke from entering stairwells during a fire and ensure evacuation. Staircase doors must resist fire for 60 minutes. Vestibules between fire doors are not allowed as they impair pressurization. Systems must be electronically controlled and automatically tested for operation in the event of a fire.

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