| 摘要 |
<p>The hood (1) has an enclosure (2) including a gas inlet and a gas outlet arranged for laminar flow of gas between the inlet and the outlet. A hopper (6) includes a gas inlet and a gas outlet. A door (11) separating the hopper and the enclosure is arranged, so that the gas cannot pass when the door is closed. A pipe is arranged to direct gas from the gas outlet of the hopper to the gas inlet of the enclosure. The pipe includes a side passage including an internal space of a double side wall separating the enclosure and the hopper, where the door is mounted in the double side wall. An independent claim is also included for a method for gas circulation.</p> |
