ANSI-ASC 14.9:2019现行
Disappearing Attic Stairways
出版：American Ladder Institute
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基本信息
标准编号： ANSI-ASC 14.9:2019
标准类别：Standard
出版单位：American Ladder Institute
标准页数：0
标准简介
This standard prescribes rules concerning the safe design, construction, testing, care, installation and use of permanently installed metal or wood, disappearing attic stairways of various types designed to be used for access to upper levels such as attics. Household units with duty ratings of 250, 300 and 350 lbs., or commercial units with a rating of 500 lbs.
本标准替代的旧标准
