The room that do not have dirt has 5 character: (L) wear; (2) cost; (3) adaptability; (4) can safeguard a gender; (5) is cleaned. (1) wear: The room that do not have dirt should have those who accord with interior of the environment, room that do not have dirt to clean solution and vibration, equipment, air to filter fast material of the system. And wear, also depend on grade of the room that do not have dirt to build at the same time. Semiconductor Fabs tendency chooses aluminium, be based on its wear, however, it is not cheap substance. (2) cleans: In pharmacy and ergonomics industry, without the wall of dirt room need has be cleaned easily and wipe, till the character that prevents the pollution of ultravirus or bacterium. In Biotech market, cleaning real ground is a the mainest business. (3) cost: Cost of microelectronics C/R construction may cost $10 100 million. Fab can be faster be built to rise, the product also can reach this market more quickly. The catchword of a lot of semiconductor companies is cheaper it is better to mix. However money will become a very main consideration factor. (4) adaptability: A few manufacturers think adaptability can save brushstroke money, and adaptability is meant the system can move arbitrarily or be changed and won't bring about huge loss. The ability of the owner of C/R and architect is the key that changes one C/R, so they never finalize the design original design. (5) safeguards a gender: To without dirt room C/R character, the part of stricter requirement is floor, ceiling, and the part of wall. As to the problem of maintenance, are due its are preferential class. In application force face, ceiling, floor reachs wall 3 person in the most important for the ceiling, its include the mesh such as HEPA and ULPA, its can filter the small particle of the room, and its regular meeting needs because of what differ individually, its come apart, supply the cubby of each different area, ever someone says: Because some kind of reason is restricted,be like built budget, besides the penny of a few, its ceiling will tend more expensive degree, actually the ceiling is a quite complex system its must filter strictly particle, its devise reason must accurate.

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