The presence of four members of the Zoning Board of Appeals shall constitute a quorum. The concurring vote of four members shall be necessary to effect any variation or variance in this chapter, to reverse any order, requirement, decision or determination appealed from or to decide in favor of the applicant in any matter before the Board. The Board shall keep minutes of its proceedings, showing the vote of each member on every question and, if any member is absent or fails to vote, indication of such fact. The Board shall also keep records of its review and other official actions. Every rule, determination, regulation, amendment or appeal thereof, and every order, requirement and decision of the Zoning Board of Appeals, shall immediately be filed in the office of said Board.