Table 14.1.

Values of and

		Turbulent flow cleanroom with small air change rate	Turbulent flow cleanroom with large air change rate (120 h−1 or above)	HEPA filters installed on the ceiling (or wall) with 40 % area	Filters installed fully
Calculation with room average concentration		1–1.2	0.64–0.86	0.4	–
Calculation with concentration in mainstream area		0.75–0.84	0.43–0.65	0.2	0.1

Note: N and N _v are the room average particle concentrations calculated with the uniform and the nonuniform distribution theories, respectively. N _a is the particle concentration in the mainstream area calculated with the nonuniform distribution theory