*/*_The most commonly used method for the design of duct size is the?

1.	/_The most commonly used method for the design of duct size is the?
A.	Velocity reduction method
B.	Equal friction method
C.	Static regains method
D.	Dual or double method
Answer» D. Dual or double method

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*/*_The most commonly used method for the design of duct size is the?

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/_The most commonly used method for the design of duct size is the?