| 摘要 |
<p>PCT No. PCT/SE96/01383 Sec. 371 Date Apr. 30, 1998 Sec. 102(e) Date Apr. 30, 1998 PCT Filed Oct. 29, 1996 PCT Pub. No. WO97/16608 PCT Pub. Date May 9, 1997The 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 the drain conduit (13), for generating such a negative pressure in the drain conduit giving rise to an evacuating flow of air from the room in question in the building through the at least one unit (11) and through the drain conduit (13).</p> |
