Static Pass Box
The static pass boxes are known to transfer materials between two clean environments which are equally clean and are designed to work with minimal personnel movement while dynamic pass boxes are used to pass through materials from an uncontrolled environment to a controlled environment. A static pass box should never be used to transfer material between a clean room and a non-clean room.
A dynamic pass box is a cubicle box which has got interlocked doors located on both sides. This protects the controlled environment from being polluted while the transfer of material is taking place inside. A static pass box, on the other hand, has got an electromagnetic interlocking arrangement which is located between the two doors. The arrangement is fitted with an LED indicator which helps to show whether any door is open.
A Dynamic Pass Box has got a system known as an Interlock Guard which helps to control both the outlet and the inlet so that there is no time that the two are opened. Due to this, dirt and other loose particles are removed from the materials being transferred to the manufacturing area and vice versa but a Static Pass Box doesn’t have such a feature since it only transfers material between two equally clean environments.
A Dynamic Pass Box is fitted with a suction filter of around 0.3 microns that is a stainless steel product and a supply filter of about 10 microns that is made of aluminum. A Static Pass Box doesn’t have the filters. The Dynamic Pass Box also has a pressure gauge ranging from 0 to 25 mmwc. It is also fitted with a motor blower of 1/5 hp for blowing out dust particles. The Static Pass Box is designed as an air-lock device to prevent ambient air from entering or clean air from disappearing from the cleanroom.