21. The Board, in matters within its authority and the limits of its powers, shall decide any question submitted to it and may issue any ordinance which it deems expedient and adjudicate at its discretion upon the costs and expenses of the investigations held by it, of the trial of the suits submitted to it and of the execution of such ordinances.
The decisions of the Board on any question of fact within its jurisdiction shall be final and without appeal.
R. S. 1964, c. 229, s. 21.