STD-4C
Classification of cluster mailboxes in the United States / From Wikipedia, the free encyclopedia
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STD-4C or STANDARD-4C refers to a set of standards and regulations set by the United States Postal Service regarding the specifications of cluster mailbox units used in new construction. All multi unit constructions building plans submitted after October 6, 2006 are required to use STD-4C compliant mailboxes[1]
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