Dear KhunThanee
As we already survey at the area for install cold room (MK-67 : Walk In Cold Room 1 Unit) and we found that level of floor at actual site do not the same level so we would like you please kindly adjust level of floor to the same level because of now the floor drop to 10 mm. (level outside = level outside) as attached of photos.
Remark : If the floor at actual site drop to 10 mm. , the ramp-al checker plate will be above more than cold room as attached of drawing.