规定高度 meaning in English

predetermined altitude
specified altitude

In case of the real limitations given by the objective circumstances where the requirement of 2 . 5 meters in height can by no means be met , the height of installation may be appropriately lowered with the examination and approval of the district / county environmental protection departments in the locality , but the minimum height from the ground outside to the bottom of the racks shall be no less than 1 . 9 meters
确因客观条件所限，无法达到规定高度的，经所在地的区、县环境保护部门审批同意，可以适当降低安装高度，但空调设备托架底端距室外地面的最低高度不得小于1 9米。