Graphics Programs Reference
In-Depth Information
In or Out?
Do not confuse Flow Direction with the direction of the arrow shown
on the connector itself. You may have a connector with an arrow
that points away from the equipment, indicating the direction of
duct from that point, while the direction of the air is into the
equipment. Flow direction is important because when you use the
equipment in a project, the flow direction must coincide with the
objects to which the equipment is connected. If your connector flow
direction is
in
, the object to which it is connected should have a flow
direction of
out
. Making a connection between connectors with the
same flow direction will produce analysis errors in your projects.
System Classification
System Classification determines which system type can be connected
to the connector. For duct connectors, the choices are Supply Air,
Return Air, Exhaust Air, or Other Air, or you can choose Fitting or
Global.
Selecting Supply, Return, or Exhaust Air will mean you can connect to
(or create) those types of systems, remembering that if you set up an
outside air system type in your project using supply air, then you can
only use a supply air connector for this system. Other Air is used for
purely graphical representations of ductwork that will not create an
intelligent system.
By selecting Fitting, you will remove all parameters other than angle,
shape, and size, and the connector will act as a fitting, not able to
calculate or preset a flow rate but instead just pass it through the family.
Global is used for families such as fans with connectors that can be used
for more than one system category.
LossMethod
The Loss Method parameter allows you to assign either
a coefficient, by placing a value in the Loss Coefficient parameter, or a
specific loss, by placing a value in the Pressure Drop parameter. Keep in
mind that these values are for the selected connector. If you have
