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2. 2) Fujishiro Y, Iwasaki T, Ojima J, Shibata N, Yamane K (2000) The Uniform Stream of the Open-type Push-Pull Ventilator and Weld Quality. Excerpts from The 40th Meeting of The Japan Occupational Hygiene Association, 140-1.
3. 3) Ordinance on Prevention of Hazard Due to Dust (2000) Ministry of Labour Ordinance No. 41 of October 31.
4. 4) Goodfellow H, Tahti E (2001) Industrial Ventilation Design Guidebook, 649, Academic Press, California.