| 摘要 |
PURPOSE:To make the wall opening for fitting the ventilating device smaller by a structure wherein a suction passage and an exhaust passage respectively consist in arranging a circular arc suction casing and a circular arc exhaust casing so as to surround a centrifugal type multiblade fan in order to communicate to the suction port and the exhaust port of a back cover in the ventilating device, which performes suction and exhaustion simultaneously. CONSTITUTION:The suction casing 7 and the exhaust casing 8 are respectively arranged so as to surround the centrifugal type multiblade fan 4 and to locate both the inner ends of the casings 7 and 8 symmetric with respect to the center of the fan 4. The inner side of the suction casing 7 communicates to the suction air draw-in port 15 of a partition wall 6. Furthermore, an indoor blowoff port 9 is formed between the outer end surface of the suction casing 7 and the inner end outer periphery of the exhaust casing 8. The inner end of the exhaust casing 8 communicates to the indoor suction side. An exhaust passage 10 is formed with the tip inner side surface of the exhaust casing 8 and the inner end inside surface and extended through a guide part 12 in such a manner as to go round an air draw-in port 15 in order to communicate to the outdoor side exhaust port 19 of the back cover 5. Owing to the structure as mentioned above, an outdoor side suction port 20 and the outdoor side exhaust port 19 can be located closer to each other, resulring in enabling to make the wall opening for fitting the ventilating device smaller. |
