NATE Air Distribution Installation Practice Questions - NATE Air Distribution Installation Specialty Exam

In Manual D, the total effective length (TEL) used to size a duct run is the length of which path?

The shortest supply run plus the shortest return run The average of all supply and return runs The longest combined supply-and-return run, including the equivalent lengths of its fittings Only the straight sections of the main trunk duct

Correct Answer:

The longest combined supply-and-return run, including the equivalent lengths of its fittings

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