| 摘要 |
PROBLEM TO BE SOLVED: To make a mounting hole for a ventilation fan small, and enhance amount of ventilation, and moreover reduce noise. SOLUTION: A ventilation hole 1 provided in a room is connected with the coupling part 10 of the exhaust duct 6 of a blower part 4 provided outdoors by ventilation duct 3. The above blower part 4 is equipped with a blast fan 8 and a motor 9 within a case 7, provided with an intake port 5 and an exhaust duct 6, and it blows air from the blower part 4, and makes the pressure of the coupling part 10 negative, and sucks indoor air from the ventilating port 1 connected to the ventilating duct 3, thus ventilating. At this time, increasing the quantity of blast of the blower part 4 can enhance the quantity ventilated. Moreover, since the blower part 4 is located outside, the ventilation fan can inhibit the penetration of noise of the motor 9 or the fan 8 into a room. Also, since there is no need for attaching a fan into the mounting hole, this can be made small in size. |
