When firing appatatus or material, if there is water ejection, the furnace should have holes to eject water vapor or other waste gases in order to protect the elements service life.

• 如果烧制器件或材料时，在加热过程中有水分排出，炉子要留有排气孔，以排除炉内的水分或其它有害废气，以免影响元件的使用寿命。