| 摘要 |
<p>The drain system in a building is divided in at least two parts, namely a first part (2) arranged to receive drain water contaminated to a relatively high degree from one or a plurality of first units (3), and a second part (10) arranged to receive drain water normally contaminated to a lower degree from one or a plurality of second units (11, 12). The second drain system part (10) comprises at least one drain conduit (13) and at least one unit (11) connected thereto and so constructed that it lacks traps preventing a flow of air therethrough. An apparatus (16) is connected to said drain conduit (13), for generating such a negative pressure in said drain conduit giving rise to an evacuating flow of air from the room in question in said building through said at least one unit (11) and through said drain conduit (13).</p> |
