Why cannot it be replaced? Because of insecurity.
Electric drying at the bottom of the box opened with fresh air satisfaction hole, the top of the operating room has ventilation dispatching mouth, the gas can be heated from the ventilation of the natural discharge operation room, operating room is a closed container, so only to withstand a very small amount of gas pressure differential.
Electric vacuum drying chamber due to bear a negative effect of atmospheric pressure, so the sealing is quite good, assuming the vacuum in the condition of heating, the expansion of the operating room gas may be due to burst observation window tempered glass or containers and attack explosions.
