| 摘要 |
Apparatus and method for removing stale air from a residence or other enclosed space, and replacing that air with fresh air from outside the enclosed space. Stale air outlets are placed at the ceiling in one or more locations throughout the enclosed space and ducts connect those outlets to an air vent elevated in relation to the stale air outlets. An inlet air passage extends between a fresh air inlet located outside the enclosed space, and the air return side of a forced-air heating/cooling unit in the enclosed space. Warm air rises to the ceiling within the enclosed space, increasing in pressure and flowing through the stale air outlets to the relatively lower-pressure outside air. This air flow induces an inward flow of fresh air into the system. The outgoing and incoming air flows move through a heat exchanger, allowing thermal recovery of heat due to differential temperatures between the two air flows. The system operates in a passive mode to exhaust stale air and induct fresh air while the fan of the heating/cooling unit is not operating, and accomplishes the same result in a mechanical mode when the fan operates.
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