| 摘要 |
<p>A ventilation assembly (10) for a window or door assembly is provided with an anti-sound system (80). The anti-sound system may include a sound generator (82), a noise sensor (88) and an error correction noise sensor (100). A control box (86) is provided for the anti-sound system (80). A solar cell (96) may be provided on a weather canopy (14) of the ventilation assembly for providing power to the control box (86). The ventilation assembly may alternatively comprise a wall vent, chimney or stack vent ventilation system.</p> |
