Table 2.

Particle load with and without LAF depending on time of measurement

	n	0.3 µm	0.5 µm	1 µm	2 µm	5 µm	10 µm
LAF
Empty OR	18	20,632 ± 49,303	2876 ± 6270	452 ± 825	236 ± 473	88 ± 184	59 ± 182
Setting prepared	18	11,406 ± 16,111	3573 ± 3822	1737 ± 2194	1198 ± 1761	560 ± 955	265 ± 786
Ongoing operation	18	19,401,148 ± 55 803,469	1,704,937 ± 4,476,903	168,806 ± 386,736	36,474 ± 76,345	2267 ± 4059	668 ± 1 143
Factor		940	592	373	154	25.7	11.3
p (Friedman)		p < 0.01	p < 0.01	p < 0.01	p < 0.01	p = 0.174	p = 0.057
Non -LAF
Empty OR	18	17,853,868 ± 12,096,453	1,553,190 ± 1,021,798	64,291 ± 30,292	7636 ± 2707	825 ± 581	353 ± 321
Setting prepared	18	26,792,344 ± 11,271,949	2,778,190 ± 1,515,588	167,070 ± 83,685	39,988 ± 11,521	8157 ± 2467	3455 ± 1475
Ongoing operation	18	56,953,435 ± 68,735,379	4,777,277 ± 3,568,511	366,304 ± 330,977	95,495 ± 91,967	14,674 ± 13,143	5987 ± 5940
Factor		3.2	3.1	5.7	12.5	17.8	16.9
p (Friedman)		p < 0.01	p < 0.01	p < 0.01	p < 0.01	p < 0.01	p < 0.01