| 摘要 |
<p>A device for use in an air exhaust system comprising an elongated box with a fixed air outlet and a slot along its length. A flexible band covers the slot. A member, defining an exhaust chamber, is movable on the box along the slot, and under the band, to communicate with the interior of the box via the slot. The member has an air inlet to which a short hose, leading from a working area to be vented, can be connected.</p> |
