Tunnel Air Shower Composition And Operations
Personnel air showers minimize the transfer of dust particles on cleanroom clothing into cleanrooms. Kwang offers Rotation Air Showers for rooms with low frequency and Tunnel Air Showers for the entering of several persons at the same time. To achieve an optimal personnel flow the modular designed Tunnel Air Showers can be put together to air showers of different sizes.
The Tunnel Air Shower offers a high cleaning effect and is designed for all cleanroom classes.
Tunnel Air Shower Composition
The Tunnel Air Shower consists of single modules that can be set in pairs opposite each other, and – depending on the required size – set in rows. They can be easily integrated into existing cleanroom systems. The length and width of a module is adapted to the filter ceiling or raised floor grid of 600 mm. Each module has a pressure chamber and a suction chamber.
The main components of the pressure chamber are the housing with two vertical nozzle rows and a HEPA filter cell.
The suction chamber with housing includes an inlet grid, a prefilter and a radial fan.
After opening the spagnolets and removing the housing walls, the pressure and suction chambers are easily accessible from the inside.
The Tunnel Air Shower comes standard with safety glass doors on the grey room and cleanroom side for installation in the cleanroom wall.
On request the modules are equipped with an air cooler to compensate for the fan heat. The installation of an air cooler is especially recommended when the module is set up outside the cleanroom.
The modules are made of powder-coated steel or stainless steel.
Tunnel Air Shower Operations
The Tunnel Air Shower has a control system with the following functions:
– Automatic start of the fans when personnel is entering the chamber
– Setting of the cleaning time
– Automatic shut down of the fans before personnel is entering the cleanroom
– Automatic locking and unlocking of the air shower doors with an optical indication through light signals
After the personnel enter the air shower tunnel, the air shower starts off and clean supply air is blown through the nozzles at high speed and impulse. The air-flow covers the complete surface of the cleanroom clothing, removes dust particles and aerosols, and transports them to the filter system. During this process the recirculation air-flows through the inlet grid and the prefilter into the suction chamber and is transported through the HEPA filter cell to the pressure chamber by the radial fan. Afterwards the airflows back through the nozzles into the air shower tunnel.
The staggered arrangement of the nozzle rows increases the cleaning effect. The optimal cleaning time (length of duration of the personnel in the air shower) is 15 seconds