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R103 Conventions <br />R103.1 Dimensions. Dimensions that are not stated as "maximum" or "minimum" are <br />absolute. <br />R103.1.1 Construction and Manufacturing Tolerances. All dimensions are <br />subject to conventional industry tolerances except where the requirement is stated <br />as a range with specific minimum and maximum end points. <br />Advisory R103.1.1 Construction and Manufacturing Tolerances. Conventional industry <br />tolerances recognized by this provision include those for field conditions and those that <br />may be a necessary consequence of a particular manufacturing process. Recognized <br />tolerances are not intended to apply to design work. <br />Information on specific tolerances may be available from industry or trade organizations, <br />code groups and building officials, and published references. <br />R103.2 Calculation of Percentages. Where the required number of elements or <br />facilities to be provided is determined by calculations of ratios or percentages and <br />remainders or fractions result, the next greater whole number of such elements or <br />facilities shall be provided. Where the determination of the required size or dimension of <br />an element or facility involves ratios or percentages, rounding down for values less than <br />one half shall be permitted. <br />R103.3 Figures. Unless specifically stated otherwise, figures are provided for <br />informational purposes only. <br />R103.4 Units of Measurement. Measurements are presented in this document in both <br />metric and U.S. customary units and were developed independently within each system. <br />The relationship between the metric and U.S. customary values is neither an exact (soft) <br />conversion nor a completely rationalized (hard) conversion. The metric values are those <br />that would have been used had the requirements been presented exclusively in metric <br />units; the U.S. customary values are those that would have been used had the <br />requirements been presented exclusively in U.S. customary units. Therefore, the user is <br />advised to work entirely in one system and not attempt to convert directly between the <br />two. <br />R104 Referenced Guidelines and Standards <br />R104.1 General. The guidelines and standards listed in R104.2 are incorporated by <br />reference in this document and are part of the requirements to the prescribed extent of <br />each such reference. The Director of the Federal Register has approved these guidelines <br />and standards for incorporation by reference in accordance with 5 U.S.C. 552(a) and 1 <br />CFR part 51. Copies of the referenced guidelines and standards may be inspected at the <br />Architectural and Transportation Barriers Compliance Board, 1331 F Street, NW, Suite <br />1000, Washington, DC 20004; at the Department of Justice, Civil Rights Division, <br />17 <br />