72 CLCH-SVX07C-EN
Component Installation Requirements
Connections made directly to the discharge opening of a housed fan should have a minimum of
three fan diameters of straight duct before any turns or transitions. The ductwork should be the
same size as the fan discharge opening. The first turn of the connection should be in the same
direction as the fan rotation as shown in Figure 57. The air that the fan discharges into the duct is
extremely turbulent and requires some length of duct to stabilize. Abrupt changes in ductwork
directly off the fan discharge may adversely affect fan performance and acoustics.
Damper Connections
For standard damper sections, size the attached ductwork to fit the opening of the damper. The duct
opening dimensions should be in the unit submittals. Ensure the insulation does not obstruct the
damper opening when using a lined duct (see Figure 58 and Figure 59).
Figure 57. Typical discharge ductwork recommendations
Splitters or
turning vanes
Vane turns in same
direction as fan rotation
3 fan
diameter
minimum
Figure 58. Typical section with duct flat/flange connection-
uninsulated or externally insulated
Figure 59. Typical section with duct flat/flange connection-
internally insulated
Unit
Section
Flat Connection
Uninsulated Duct
Airflow
Unit
Section
Flat Connection
Insulated Duct
Airflow
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