| 摘要 |
An apparatus for filtering air in tunnels comprises a frame (2), a filtering unit (4) connected to the frame (2), barrier means (21) for creating a barrier designed so that when in use it longitudinally divides a tunnel into two zones, a plurality of intake inlets (10) in fluid communication with the filtering unit (4) for drawing an air flow to be filtered at a face of the barrier and directing it towards the filtering unit (4), and adapting means (17) for varying the barrier configuration between a minimum extension operating configuration and a maximum extension operating configuration so that the apparatus can be used in tunnels which have various cross-sections. The intake inlets (10) are distributed at least along an upper outer portion of the barrier, whatever the operating configuration of the barrier.
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