| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a ventilation fan for a duct which does not deteriorate blast performance by making small the dimension of a ventilation fan body even if a fan casing cannot acquire an optimal shape. <P>SOLUTION: The ventilation fan for the duct includes a ventilation fan body 1 having the fan casing 2 in which a suction port, a discharge port of air, and a tongue portion which leads air flowing accompanied by the rotation of a centrifugal fan to the discharge port are formed, and a tube-like duct connection port 6 which is attached detachably to the ventilation fan body 1, and makes the discharge port communicate with the duct, the suction port arranged at the indoor side, the duct connection port 6 arranged at the outdoor side, air sucked from the air suction port discharged to the duct through the duct connection port 6 where a protrusion 6a which connects the edge of the tongue 2a side of the fan casing of the discharge port and the inner wall side face in the vicinity of the opening of the duct side of the duct connection port 6 is formed when attached to the ventilation fan body 1 in the duct connection port 6. <P>COPYRIGHT: (C)2012,JPO&INPIT |
