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Did you look at the minimum flow setting in the zone? It's usually set to a fraction of the design flow rate (say 0.3). This would cause the minimum flow rate to rise with the design flow rate. In detailed edit mode open the Zone Parameters window, go to the Air Flow Tab and see what it says under Minimum Flow. Is it set to a Ratio? You can also check under the System editing window. Go to the Fans -> Flow Parameters and see what it says under Min Flow Ratio (MIN-FLOW-RATIO).