A conveyor is provided comprising an endless conveyor chain, a plurality of spacers, and at least two conveyor supports mounted on opposite sides of the spacers to permit air to freely flow therethrough. Each conveyor support comprises at least one elongate member mounted to any of a second plurality...http://www.google.es/patents/US5029697?utm_source=gb-gplus-sharePatente US5029697 - Clean room conveyor
