The present invention improves both the quality and the flow of air delivered by a stationary fan such as a ceiling fan and a portable fan. Ceiling fans provide limited indoor air flow, but do not function as air conditioning and quality improvement apparatus. The present invention provides fans with...http://www.google.fr/patents/US6244820?utm_source=gb-gplus-shareBrevet US6244820 - Method and apparatus for multifunctional fan
