Q: Why is the reserve head showing as 0.1 in red on the selector page when there is plenty of reserve head on the curves?
A:
The reserve head shown on the selector page is based on the minimum duty point. When multiple duty points are selected, the reserve head and volume turn down are calculated based on the worst duty point to ensure that the fan can handle all selected duties. This approach guarantees that the fan can meet all requirements for the selected range of duties. See screenshot:
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