| 摘要 |
<p>A ventilation system for a building (10) having a dust laden interior atmosphere and includes an air inlet (20) and an air outlet (21) opening outwardly through a peripheral wall in laterally spaced relation. An elongated duct (9) is disposed within the building including gravity collapsible inner and outer flexible tubes (14, 13) constructed of good heat transfer materials and first and second enlarged hollow duct end enclosures (11, 12). One end of the inner tube extends through first enclosure (11) and one end of the outer tube opens into the first enclosure exteriorly of the inner tube. An inlet duct (19) communicates the air inlet (20) with the one end of the inner tube (14) and an outlet duct (18) has a first end opening into the first enclosure (11) and a second end communicated with the outlet (21). The other end of the outer tube opens into the second enclosure (12) and the other end of the inner tube connects to a pipe which extends through the second enclosure (12) and includes air outlet structure (15) opening into the interior of the building. The second enclosure (12) includes an interior ambient air inlet opening outwardly of the inner tube and provided with first air pump for pumping building interior air into the second enclosure (12). The inlet duct includes second air pump for pumping ambient air from the exterior of the building into the first end of the inner tube (14).</p> |
