The passenger door and observationdoor are installed at the intermediate height of door.
行人门及观察窗在门扇的高度上居中；
2
The observation window on the door is made of double-layer tempered glass, the material heated in the oven can be observed clearly, meanwhile, the thermal insulation is well.
箱门观察窗为双层钢化玻璃结构，能清晰观察箱内加热的物品，又有良好的隔热效果。
3
There's lighting inside the case and sight window on the outside door, convenient for observation.