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

In ACCA Manual D duct design, which calculation determines the friction rate used to size a residential duct system?

Available static pressure divided by total effective length, multiplied by 100 Total external static pressure multiplied by the number of supply registers Blower CFM divided by the cross-sectional area of the trunk duct Design temperature difference multiplied by the heat-loss factor

Correct Answer:

Available static pressure divided by total effective length, multiplied by 100

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