A holding oven designed for creating a natural convection current in the chamber of the oven, and constructed by fixing the heater element to a first material characterized by its high thermal conductivity for rapid build-up of thermal gradient into an insulated space, while that heater element is simultaneously...http://www.google.es/patents/US5653905?utm_source=gb-gplus-sharePatente US5653905 - Royalton natural air movement system
