How is the equivalent length of a duct determined?
A) Add the trunk duct length to takeoff and the branch duct length.
B) Add the equivalent lengths of all fittings from blower to register.
C) Add the trunk duct length to takeoff with the branch duct length and subtract the equivalent lengths of all fittings used from blower to register.
D) Add the trunk duct length to takeoff, the branch duct length, and equivalent lengths of all fittings used from blower to register.
D
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