Erection and installation of coin-operated or non-coin-operated mechanical amusement devices as permitted within an arcade shall comply with all local, state and federal fire and safety regulations, statutes and codes. In addition, for each one square foot of floor space occupied, taken up or covered by a machine (to be measured at its widest, deepest and longest points, whether touching the surface of the floor or not), there must be three square feet of open space and space for the unobstructed flow of customers. If machines are located along an aisleway, the minimum width of aisles between the machines shall be 13 feet. In computing "open space" as used in the section, any and all interior sections of the structure reserved for office, rest room, operation, storage, or other facilities shall be deducted and only the actual open unobstructed floor space shall be considered "open" for purposes of this calculation.