| 摘要 |
Air inlet opening (4) into premises (1) which are under a slight partial vacuum with respect to the outside (2) and which is characterised by a ventilation air nozzle (7) joined side by side to a second nozzle (9) into which the air from the premises (1) is drawn. The turbulent flow resulting therefrom promotes the mixing with the cold air and prevents drafts. <IMAGE>
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