| 摘要 |
1,176,535. Axial-flow fans. E.I. DUPONT DE NEMOURS & CO. Feb.2, 1967 [Feb. 3, 1966], No. 5135/67. Heading F1C. [Also in Division F4] In an air-cooled heat exchanger, a fan 15 is protected from heat exposure by air passing over the drive motor 27 and gear-box 28 of the fan, the air being induced through thermally-insulated ducts 26 and a draft tube 29 by the action of the fan 15. |
