Table 1.

The air cleaning factor (ACF) provided by continuous operation of the ion emitter: (a) VI-2500 and (b) AS150 mm (+)/(−)

Aerodynamic particle diameter (μm)	Air cleaning factor
	15 min	30 min
(a) VI-2500
0.04	5.2±2.6	15.3±2.6
0.1	6.8±0.7	31.0±2.0
0.2	6.7±0.5	33.6±5.5
0.5	5.7±1.1	25.8±7.3
1	5.0±1.1	18.7±3.6
2	5.3±1.7	22.1±5.1

Aerodynamic particle diameter (μm)	Air cleaning factor
	15 min		30 min		60 min
	AS150MM (+)	AS150MM (−)	AS150MM (+)	AS150MM (−)	AS150MM (+)	AS150MM (−)
(b) A5150MM(+)/(−)
0.04	1.4 ± 0.3	1.2 ± 0.2	2.1 ± 0.4	1.8 ± 0.2	3.9 ± 0.8	3.9 ± 0.2
0.1	1.9 ± 0.3	1.7 ± 0.2	2.9 ± 0.6	2.7 ± 0.3	5.9 ± 1.3	6.4 ± 0.5
0.2	1.5 ± 0.1	1.4 ± 0.1	2.3 ± 0.4	2.3 ± 0.2	5.4 ± 1.4	6.2 ± 0.4
0.5	1.9 ± 0.9	2.3 ± 1.1	2.9 ± 1.4	3.4 ± 1.6	5.5 ± 2.2	7.2 ± 2.8
1	1.9 ± 0.6	2.2 ± 1.0	2.6 ± 0.8	3.1 ± 1.2	4.7 ± 1.0	5.9 ± 1.9
2	2.3 ± 0.7	2.4 ± 0.9	3.0 ± 1.0	3.2 ± 1.1	4.7 ± 1.1	5.6 ± 1.6