| 摘要 |
The ventilator comprises two tube sections (6, 9), the first one having at least one side opening (7) acting as an air inlet, as well as an outlet opening (8) through which air can enter or leave, and the second one is housed inside the first one in the region between the two openings. The second tube section also has inlet and outlet openings (11,10), between which there is at least one particle separating filter (22). The second tube section can be moved inside the first tube section between its two opposite ends in order to alter the size of the air inlet in the first tube section and therefore the flow of air through the ventilator. |
