| 摘要 |
PURPOSE: To collect tobacco smoke formed by smoking in a wide range of area without setting required parts on a floor surface. CONSTITUTION: A suction box 4, which is provided with an air suction opening 5 on the position above a site where tobacco smoke rises from a smoking area and also provided with an air circulating unit 3 with an air cleaning filter 8 inside, is set below a ceiling 2. An exhaust duct 9 encircling the suction box 4 from the plane view is set on a ceiling section of the smoking area, and the exhaust duct 9 and the suction box 4 are connected together by a communicating pipe 10 so that exhaust air from an air circulating flow unit 3 is flowed to the exhaust duct 9. Also an air outlet 11 for forming the exhaust flow A1 from the exhaust duct to be formed centripetally toward an air suction opening 5 of the air circulating flow unit 3 almost in the horizontal shape is formed on the inner peripheral face of the exhaust duct 9. |
