Length is not necessarily limited, but it becomes difficult to cope with changes in length on heating and cooling (typically around 0.1 to 0.5% of the length) if the kiln is very long.
长度不一定是有限的，但它变得难以应付的加热变化的长度和冷却（通常大约为0.1〜长度的0.5％），如果窑是很长的。