: Fittings can be grouped and saved into individual project files, which are small enough for easy transfer and navigation.

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When fans are installed with poor inlet or outlet conditions (e.g., a fan blowing directly into a 90-degree elbow without a straight length), the fan's performance degrades significantly. Manufacturers rate fans in laboratory conditions; the DFD provides the coefficients necessary to calculate the real-world penalty.

The heart of the data. For each fitting ID, this table lists: