SC HVAC Contractor Practice Questions - South Carolina HVAC Contractor License Exam

What is the proper method for calculating duct size for a branch run serving a single room?

Use the same size as the trunk duct Calculate required CFM for the room, then size the duct using friction rate tables per Manual D Always use 6-inch round duct Size based on the room's square footage only

Correct Answer:

Calculate required CFM for the room, then size the duct using friction rate tables per Manual D

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