Escape ladder, also known as fire escape ladder, is a kind of building facility used as an escape way in case of fire. It is stipulated in many national fire protection laws and listed in the inspection items of building fire protection license.Escape ladders are usually different from the main daily stairs, and are used as the characteristic setting of the second passage. Many early buildings in the United States are set outside the building in the form of welded iron frames, which on the one hand will not constitute a burden on the building structure, on the other hand will not occupy indoor space when set outdoors, and on the other hand, external fire escape can avoid chimney effect.For the later new buildings, based on aesthetic factors, the escape ladder has been changed into the building, and thick but easily one-way fire doors have been used to prevent fire and smoke from escaping up the escape ladder to each floor.
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