| 摘要 |
A fabric flow restriction and method for adjusting the flow resistance throu gh a fabric duct (12, 14, 16, 18 and 20) enables balancing the airflow through a network of fabric ducts. The fabric ducts are air permeable and/or include discharge openings that evenly disperse supply air from within the duct to a room being heated, cooled, ventilated, or otherwise conditioned by the air. Disclosed embodiments include flow restrictions (28, 30 and 32) that are adjustable by tightening a drawstring (90) that constricts an annular web disposed within the duct or inside the duct, or by interchanging fabric mesh es (38) or various flow resistance. In any case, the flow restriction consists of flexible fabric that tends to conform to the changing shape of a fabric duct as the duct alternately inflates and deflates due to changes in air pressure within the duct.
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