The purpose of air conditioning ductwork is to deliver air from
the fan to the diffusers which distribute the air to the room.
Air Moves Through the Ductwork in Response to a Pressure
Difference Created by the Fan
The necessary pressure difference will be a function of the way
the ductwork is laid out and sized.
The objective of duct design is to size the duct so as to
minimize the pressure drop through the duct, while keeping the
size (and cost) of the ductwork to a minimum.
Proper duct design requires a knowledge of the factors that
effect pressure drop and velocity in the duct.
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