Meetings of the Board shall be held as the Board may determine. The Chairman or, in his absence, the Vice Chairman may administer oaths, compel the attendance of witnesses and the submission of explanatory data. Alternate members shall sit and may actively participate in hearings. The first alternate shall vote if a member of the Board is unable to serve at a hearing and the second shall vote if two members of the Board are unable to serve at a hearing. Without the first alternate member, the second alternate member shall serve in the position of the first alternate. No member or alternate may vote on any matter before the Board unless they have attended all hearings concerning that matter. All hearings of the Board shall be open to the public. Following a public hearing, the Board shall render a decision within forty-five days. The Board shall include in its decision all findings of facts, conditions, the vote of each member participating thereon, the absence of a member or failures to vote. All decisions shall be filed in the Building Inspector's Office within twenty working days, and shall be a public record.