Decision. Following a public hearing, the Board shall render a decision within 20 days. The Board shall include in its decision all findings of fact and conditions, showing the vote of each member participating thereon, and the absence of a member or his or her failure to vote. Decisions shall be recorded and filed in the office of the Secretary, and a copy posted in the office of the Town Clerk, within 10 working days from the date when the decision was rendered, and shall be a public record. The Board shall keep written minutes of its proceedings, showing the vote of each member upon each question, or if absent or failing to vote, indicating such fact, and shall keep records of its examinations, findings of fact, and other official actions, all of which shall be recorded and filed in the office of the Secretary in an expeditious manner upon completion of the proceeding. For any proceeding in which the right of appeal lies to the superior or supreme court, the Board shall have the minutes taken either by a competent stenographer or recorded by a sound-recording device.