5 CFR §2421.14

Appropriate unit means that grouping of employees found to be appropriate for purposes of exclusive recognition under 5 U.S.C. 7111, and for purposes of allotments to representatives under 5 U.S.C. 7115(c), and consistent with the provisions of 5 U.S.C. 7112. In determining an appropriate unit in a proceeding under part 2422 of this Chapter, for the eight offices listed in 3 U.S.C. 431(d)(2), employees shall be excluded from the unit if it is determined that such exclusion is required because of a conflict of interest or appearance of a conflict of interest or because of the President's or Vice President's constitutional responsibilities, in addition to the standards set out in 5 U.S.C. 7112.