| 摘要 |
Air is drawn in, at a predetermined rate, from a boundary region (12) adjacent the roof (1) of a building and directed to a space in the interior of the building which is to be heated. The rate at which air is drawn from the boundary region adjacent the roof is preferably controlled, and the drawn air may be filtered and/or supplementarily heated where required. The system provides an economical and environmentally friendly means of space heating for a building.
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