This application relates to the field of ventilation electrical appliances, and in particular to a ventilation device with a silent air duct, comprising a housing, a
volute air duct, and a fan
assembly. The housing inlet end is equipped with a detachable
composite filter module that achieves layered interception of sand and dust and allows for tool-free quick removal. The inner wall of the
volute air duct, where the
airflow turns, is embedded with
noise-reducing components to eliminate eddies and
resonance noise within the duct. Adaptive sealing components are provided at the joints of the panels of the housing to compensate for gaps in the housing joints and prevent sand and dust leakage. The
volute air duct inlet end has a diffuser to ensure smooth
airflow, a guide section on its inner wall, and a
suppressor to prevent
backflow. The
noise-reducing components include
honeycomb elements and sound-absorbing elements. The
composite filter module includes a frame and multiple filter
layers. The adaptive sealing components include a first seal and a second seal. This application achieves the technical effects of effectively filtering sand and dust, reducing noise, compensating for housing gaps, ensuring smooth
airflow, and preventing
backflow.