| 摘要 |
A heat exchange ventilator (10) for fitting in a circular aperture in a wall or window of a building consisting of a heat exchange unit (12) of circular cross section, the unit (12) having concentric annular passages (16) extending for a major portion of the length of the unit through which outgoing and incoming air flows in opposite directions in adjacent passages. Air flow control guides (24) are provided to cause the air to flow in each passage (16) in a helical path. A fan (36) is mounted at each end of the heat exchange unit (12) to draw the incoming and outgoing air through their associated passages (16) and the two fans (36) are connected by a shaft (38) extending through the centre of the unit (12) and driven by a single motor (40). |
