Table 14.2.

Particle concentration in local clean area of the operating room (0.4 m above the floor)

		Particle concentration with diameter ≥0.5 μm (pc/L)
		Mainstream area	Vortex region
Before starting up		4,350	4,200
After starting up/min	1	2,750	4,260
	2	225	4,060
	3	76	1,840
	4	20	480
	5	0.4	98
	6	0.035	6.2
	7	0	1.7
	8	0	0.25
	9	0	0.12
	10	0	0.035
	11	0	0.07
	12	0	0