Ex parte communications, that is, written or oral communications with the Board by or for one party only without notice to the other, are not permitted. No member of the Board or of the Board's staff shall consider, nor shall any person directly or indirectly involved in an appeal submit to the Board or to the Board's staff, off-the-record, any evidence, explanation, analysis, or advice, whether written or oral, regarding any matter at issue in an appeal. This provision does not apply to consultation between Board members nor to ex parte communications concerning the Board's administrative functions or procedures.