| 摘要 |
PCT No. PCT/EP96/01635 Sec. 371 Date Jun. 19, 1998 Sec. 102(e) Date Jun. 19, 1998 PCT Filed Apr. 17, 1996 PCT Pub. No. WO96/36445 PCT Pub. Date Nov. 21, 1996A method for cleaning and treating a ventilation duct includes the step of creating a partial vacuum in the duct and propelling a jet nozzle through the duct. The propelling device includes radially extending flexible hollow arms connected to a source of pressurized fluid to keep the nozzle substantially in the center of the duct and propelling the nozzle with the reaction thrust of the pressurized fluid emitting from the hollow arms. |
