CLR-SYSTEM-TECHNIQUE

Hints for planning

Lining of the clean-room
The lining of the clean-room, which means floor, walls and ceiling, must be made with the use of suitable material in a way that vents from leakages from or into the clean-room are avoided.
Walls and ceilings must be made of such material, as emits particles only to a small amount and must be easy to clean. The floor covering must only emit few particles and must be so resisting that it is not damaged by the working procedures in the clean-room.

Entrances
Entrances, doors and ports must be correctly dimensioned in order to allow the access of personnel and to bring in the necessary apparatus into the clean-room. These entrances must be airtight in order to guarantee the maintenance of the overpressure inside of the clean-room. The room should be planned in a way that only one door or entrance can be opened at a time, except for emergencies.

Anterooms
According to the requirements there have to be anterooms for the clean-room personnel with changing rooms, locker rooms, washing facilities, air showers, toilet rooms and other facilities.
Furthermore, depending on the requirement, there must also be anterooms for cleaning apparatus’ and other clean-room apparatus’.

Supply-air- and filter systems
Supply-air- and filter systems must have a suitable capacity in order to be able to filter the complete recirculated-air and air-conditioned air intruding into the clean-room. Depending on the requirements the supply of fresh air or of air-conditioned air must be provided. An access should be provided for the change and test of filters as well as for cleaning the ducts leading to and from the filters.

Air-conditioning system
If necessary, an air-conditioning system should be provided for prefiltering, refrigeration, heating, moistening and drying of the clean-room air.

Furniture in the clean-room
Pieces of furniture in the clean-room must correspond to the working steps in clean-room conditions and be manufactured out of material having only little emission of particles.

Clean-room illumination
Clean-room illumination must be effected in a way that it corresponds to the requirements of work in the clean-room. For most rooms an even illumination fee of shades is sufficient with a brightness of 500 – 700 Lux at the working place. Lamps on the ceiling should be flush with the ceiling and be sealed to avoid leakage flow.

Fire protection
Fire protection in clean-rooms must fulfil the requirements of the products handled, the probable demands on and the use of the clean-room and the local conditions. Fire detecting devices must be installed on the downward side of the flow in the clean-room in order to automatically switch off the fan motors in case of fire.