| 摘要 |
PROBLEM TO BE SOLVED: To eliminate as far as possible a necessity for bending a pipe of duct connected to an air suction port to increase thereby a static pressure and at the same time reduce noise and further improve a workability in installing a ventilation fan and make a cost reduction. SOLUTION: A main body frame 11 has an air suction port body fixing part 13 formed with an opening 12 along an outer shape of it at its peripheral side surface of an arcuate outside shape as seen from its top plan view, an air discharging port 14 at one side surface 11a of flat surface and a blower 15 within it. An air suction port member 23 is constricted to have an air suction port 26 though an extendable or retractable segment 26 at a central part of a belt plate 24 in its longitudinal direction, wherein the air suction port member is fixed to the suction port member fixing port 13 with screws 28. A fixing position of the air suction port member 23 in respect to the air suction port member fixing part 13 is changed to cause both position and orientation of the air suction port 26 to be changed. |
