(a) In enacting a regulation, it is presumed that:
(1) Compliance with the constitutions of the State and of the United States is intended;
(2) The entire regulation is intended to be effective;
(3) A just and reasonable result is intended;
(4) A result feasible of execution is intended.
(ORC 1.47)
(b) A regulation is presumed to be prospective in its operation unless expressly made retrospective. (ORC 1.48)
(c) If a regulation is ambiguous, the court, in determining the intention may consider among other matters:
(1) The object sought to be attained;
(2) The circumstances under which the regulation was enacted;
(3) The legislative history;
(4) The common law or former legislative provisions, including laws upon the same or similar subjects;
(5) The consequences of a particular construction;
(6) The administrative construction of the regulation.
(ORC 1.49)