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NOTE.TO BOCA° NATBONAL <br />CODE USERS <br />The 1993 editions of the BOCA Natrnna( Codes contain, for the benefit and convenience of code <br />users, vertical lines in the outside margins of some pages. _ <br />As in.previous editions, vertical lines in the margin indicate approved changes to the text of <br />code requirements. Editorial changes are not so marked. For example, lines shown in the margins <br />of the 1993 BOCA Nurinnal Codes indicate technical content changes since the 1990 editions. <br />Asterisks in the margin indicate loc:ations from which 1990 code text has been deleted. Unlike <br />the 1990 editions, these asterisks are no longer used to indicate text that has moved to a different <br />location in the code. These features are designed to streamline the review process for jurisdictions <br />wishing to adopt current, up-to-date provisions. <br />Several additional features are reflected in the 1993 editions of the BOCA Notional Code.r. <br />Definitions of terms have been rearranged in order to locate them within the chapter or section <br />that represents the predominant subject matter associated with each term. Definitions related <br />predominantly to Chapter I and those that have broad applicability throughout the code remain <br />in full in Chapter 2. All defined tcrms are listed alphabetically in Chapter 2 foUowed by either <br />the text of the definition or a reference to the section number that contains the text oF the <br />deEinition. Selected defined terms are italicized where they appear in the code in the same manner <br />as in previous editions. <br />Additionally, an indenting feature is used in tandem with the codes' decimal-based section <br />numbering system to indicate the hierarchy of each subsection. <br />The values stated in the U.S. customary units of ineasurement are to be regarded as code <br />requirements. The metric eyuivalents of U.S. customary units may be approximate.