VENTILATION DEVICE

摘要

A ventilation device (1) provided with an outer shell (2) provided with an intake (3) and an outlet (4), a blower (8) inside the outer shell (2), and an upstream air duct (9) connecting the intake (3) and the blower (8). The upstream air duct (9) is divided into an inside air duct (12) and an outside air duct (13). An active silencer configuration (17) for silencing generated sound using a signal that has an inverted phase with respect to the generated sound is provided to the inside air duct (12).