Reserve a size of 5mm, a bit like putting a washing machine? The walls of the house are all the same, of course not. The solution is: 1 If you choose a smaller washing capacity, of course, the whole will shrink, but you can't wash the big one. 2. Buy another brand to ensure that the size in this direction can meet your predetermined requirements. 3, or change to a vertical impeller washing machine, so it is easy to find a washing machine that can be installed to your predetermined size.