| 摘要 |
A device (10) connectable to a suction source for drawing off particulate matter from the air about a burning site comprises a flexible hose (11) provided along an end segment (12) with a plurality of spaced apertures (13), the apertures being covered by punch-outs (13a) in the wall of the tube. A fastener serves to connect the hose (11) at an end opposite the apertured end segment (12) to the suction source, and a coupling element (15) is provided for securing a free tip of the hose (11), at the free end of the apertured end segment (12), to the hose (11) along a middle portion thereof to thereby form a loop including at least a portion of the apertured end segment. A selectable number of the punch-outs (13a) may be removed from the hose (11) prior to a burning operation. |
