3 methods of designing ductwork and fan:
¾Equal velocity method - the designer selects the
same air velocity for use through out the system
¾Velocity reduction method - the designer selects
variable velocities appropriate to each section or branch of
ductwork
¾Equal friction method - the air velocity in the main
duct is selected and the size and friction determined from a
design chart. The same frictional resistance is used for all
other sections of ductwork
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