Design Details

In detailing the construction of the clean-room floors, walls and ceilings, the following fundamental aspects must be clear in the designer's mind.

• The materials used for finishing the room surfaces must be nonshedding, non-porous and resistant to sustaining microbial growth.

• The finished surfaces must be hard, smooth and easy to clean with no ledges and minimal surface joints.

• The junctions of room surfaces must be carefully detailed to avoid inaccessible corners, preventing dust accumulation and facilitating cleaning.

• Coving at floor-to-wall, wall-to-wall and wall-to-ceiling junctions should be detailed and the radius in the range of 40 to 75 mm, depending on the materials chosen (see Figure 6.2).

• The selected finishes must be able to withstand repeated disinfection with the cleaning methods and disinfectants identified in the plant-cleaning philosophy.

• The integration of equipment and services into the room fabric must take account of all of the above requirements.

• The number of openings in the clean-room fabric should be minimised. Doors and vision panels must be detailed flush and form a continuous surface with the adjacent wall.

• Door hardware (furniture) should be minimized with the use of concealed door-closer mechanisms and flush push plates. Door hardware should have a

Figure 6.2. Typical coving details with in situ floors/gypsum board ceiling.

smooth, hard finish with rounded shapes for easy cleaning. Materials should be nylon-coated steel, chrome-plated or stainless steel.

4.4 Fabric Interfaces

Minimization of interfaces with the clean-room fabric should be considered and in particular the following points addressed:

• Services and distribution pipework increase the amount of surface area for gathering dust in clean rooms, and therefore increase the difficulties in cleaning and disinfection. Generally speaking, services distribution and utility pipework should be minimized inside the clean room, and should utilize adjacent but separate spaces or manifold rooms, permitting ease of maintenance.

• Where utilities and services are required to enter the clean room, the penetrations should be grouped together and manifold plates should be utilized, sealed against the room finishes.

• Maintenance, both routine and long-term repair or replacement, should be addressed and the requirements for access and equipment interchangeability incorporated into the design.

Figure 6.3 illustrates many of the key issues affecting the design of the clean-room floors, walls and ceilings and their detailed interfaces.

Figure 6.3 illustrates many of the key issues affecting the design of the clean-room floors, walls and ceilings and their detailed interfaces.

Figure 6.3. Key aspects of clean-room design.

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