| 摘要 |
A method includes inflating one or more inflatable bags from a first evacuated condition within an attic space to an inflated condition. The inflatable bags are configured such that when they are in an evacuated condition, they take up a relatively small space in the attic space to be ventilated. In the inflated condition, however, the bags have a cumulative volume much larger than the cumulative volume of the bags when in the evacuated condition, and make up a desired fraction of the volume of the attic space to be ventilated. When the bags are inflated from the evacuated condition to the inflated condition, they displace a volume of atmosphere equal to the difference between the cumulative volume of the bags in the evacuated condition and the cumulative volume of the bags in the inflated condition. The bags are then evacuated from the inflated condition to the fully evacuated condition or at least a substantially evacuated condition so as to draw ventilation air into the attic space through one or more ventilation inlets to the attic space.
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