PURPOSE: To effect ventilation efficiently and simply while ensuring excellent appearance by providing a motor inside a casing mounted on a ceiling, and means for hanging a fan blade provided with an air purifier on brackets corresponding to a motor shaft.

CONSTITUTION: The unit has a fan mounted on a ceiling by means of the upper surface of a prism-shaped casing 1. A grid communicated with the exterior, which is a selective ozone generator 16 is arranged on a side surface of the casing 1. Brackets 15 protruding from both ends of the casing 1 connect a motor element to a shaft 14 with a fan blade 11 mounted thereon. A container 13 receiving an air purification element is mounted on the fan blade 11. A plate-shaped heating circuit having a printed electric resistor 12 is arranged in the fan blade 11. In this way, it is possible to allow the use of a beautiful ceiling fan without compromising decorative characteristics and obtain an efficient and simple ventilation method.