| 摘要 |
PURPOSE:To diminish noise coming into a room or leaking outside and to freely change the set position of an indoor air outlet port or an outdoor side air discharge port by a method wherein a block of duct, which is formed of a sound absorbing material and provided with a winding path inside, is attached at least on an air delivery port of either an air supply fan or an exhaust fan. CONSTITUTION:For example, a block of duct 14, which is molded of a sound absorbing material such as foamed styrene resin and provided with a winding path 13 inside, is attached on an air delivery port of an air supply fan 6, and an end 13b of the winding path 13 is connected to an indoor air outlet port 2. Thereby, the operating noise of the air supply fan 6 is simply and surely absorbed due to the property of the sound absorbing material, so that the operating noise of the air supply fan 6 is prevented from leaking into a room through the indoor air outlet port 2, resulting in a reduction in the noise level in the room. The duct 14 is replaced with another one with the winding path 13 having a different shape, so that the set position of the indoor air outlet port 2 can be freely and simply changed with the air supply fan 6 used in common. |
