The Board shall decide each appeal within a reasonable time, and notice thereof shall forthwith be given to all parties in interest. The Board's decision shall be immediately filed in its office and be a public record. In the exercise of its functions upon such appeals or upon exceptions, the Board may, in conformity with the provisions of this chapter, reverse or affirm, wholly or partly, or modify the order, requirement, decision or determination appealed from, or may make such order, requirement, decision or determination as in its opinion ought to be made.