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Installation and Maintenance 29
installation, as outlined by such organizations as
SMACNA (Sheet Metal and Air Conditioning
Contractors National Association, Inc.) should be
adhered to.
Fan Discharge Connections
When using lined duct, the insulation should not
obstruct the discharge opening. (See
Figure 24
.)
Connections made directly to the discharge opening
of the fan should have a minimum of 3 fan diameters
of straight duct before any turns or transitions. The
first turn of the connection should be in the same
direction as the fan rotation. The air that the fan
discharges into the duct is extremely turbulent and
requires some length of duct to stabilize. Abrupt
changes in duct work directly off the fan discharge
will affect fan performance.
Damper Sections
Standard damper sections include mixing sections,
filter mixing sections, face damper sections, internal
face and bypass sections, and economizer sections.
Duct work attached to the standard damper sections
should be sized to fit the opening of the damper. This
information is provided in the submittals. When using
lined duct, ensure that the insulation does not
obstruct the damper opening. (See
Figure 24
.)
Figure 24
Typical Section with Duct Flat/Flange Connections
Traq Dampers
Traq dampers are installed in mixing sections. Size
the duct connection to attach to the specified portion
on the face of the section. (See
Figure 25
.)
Figure 25
Traq Damper Duct Connections
Uninsulated Cut
Airflow
Section
Flat Connection
Insulated Duct
Section
Flat Connection
Airflow
Traq Damper
Mixing Box
W
H
d
Inlet Duct
Radius Elbow
(Sweep)
Traq Damper
Mixing Box
d = 1 hydraulic duct diameter = 2 x W x H
________
W + H
Mitered Corner