Abstract: A filtering device is adapted to be mounted in a fan having a motor cover, a rotary shaft, an impeller combined at the rotary shaft, and a rear protective grill mounting on a mounting base provided on a front end of the motor cover. The filtering device includes an inner ring plate, an outer ring plate, and a filter element. The filter element is sandwiched between the inner ring plate and the outer ring plate, and the inner ring plate and the outer ring plate are coupled between the rear protective grill and the rear protective grill lock ring. The airflow sent out by the rotation of the impeller of the fan will pass through the filter element of the filtering device, achieving the effect of purifying air.

Abstract: A housing of an axial fan that allows air to flow in an axial direction includes a frame including, on an inner surface, an air channel through which air flows, stator vanes extending radially inward from the inner surface, a motor housing supported radially inward of the stator vanes, and a motor supported on one axial side of the motor housing. A portion of the stator vanes is provided on a surface on the other axial side of the motor housing.