| 摘要 |
The apparatus for circulating air through an enclosed space 1 such as a cultivation or composting cell comprises a housing 6 having a fresh air intake duct 9, a duct 10 for supplying air to the space, a duct 5 for receiving air from the space and a discharge duct 8. A valve 15, controlled by a thermostat or hydrostat, is adjustable from the position shown in which air is circulated through the space by a fan to a position in which fresh air is passed via a heat exchanger 19 to the space and is discharged from the space via the heat exchanger and the duct 8. <IMAGE> |
