| 摘要 |
<p>An animal house (1) has an inlet duct (10) which provides fresh air to a room (7). The air is drawn by an exhaust fan (20) in a side wall (2). In a winter mode, the air source is an attic space (6) via an opening (13) in the duct (10). In a summer mode, the source is the external environment via an opening (16). <IMAGE></p> |
