Greenheck DFD Series Installation, Operation And Maintenance Manual page 40

Typical Installation
The ducting from this fan to the outside of the building has a strong effect on the air flow, noise and energy use of
the fan. Use the shortest, straightest duct routing possible for best performance, and avoid installing the fan with
smaller ducts than recommended. Insulation around
the ducts can reduce energy loss and inhibit mold
growth. Fans installed with existing ducts may not
achieve their rated airflow.
Rigid metal duct is recommended for optimal fan
performance.
Ensure duct joints and exterior penetrations are
sealed with caulk or other similar material to create
an air-tight path and to minimize building heat loss
and gain and reduce the potential for condensation.
Place/wrap insulation around duct and/or fan to in
order to minimize possible condensation buildup
within the duct, as well as minimize building heat
loss and gain.
Energy Star® Certified
Fan Model/Size
SP-A70, SP-A90, SP-A50-90-VG, SP-A90-130-VG,
SP-B70, SP-B80, SP-B90
SP-A110, SP-A125, SP-A190
SP-A200, SP-A250
Other Installation Considerations
Ductwork and Noise
Fiberglass ductboard is a better choice than metal
ductwork for reducing fan noise and is highly
recommended for low sound applications. Where metal
duct is used, sound transmission can be reduced with
flexible duct connections between the fan and the duct.
Sound and Location
The location of these fans must be taken into
consideration before installation. In critical sound
installations, insulated ductwork, flexible duct
connections or placing the fan in a remote section of
ductwork are solutions to meeting the required fan
sound levels.
Filters
The addition of an intake filter is highly recommended
for these fans, even in clean air environments excess
dirt can accumulate on wheels and motors causing
reduced performance and imbalance.
Filters, once installed, should be checked and cleaned
periodically to maintain performance.
Washable aluminum mesh filters specifically designed
for these fans are available, please consult your
representative for more information.
2 Ceiling Exhaust and Inline Fans
INSULATION*
(Place around and over Fan Housing.)
FAN HOUSING
POWER CABLE*
Seal gaps
around Housing.
ROUND DUCT*
Seal duct joints
with tape.
*Purchase separately.
Recommended
Duct Dimensions
6 inch round
8 x 6 inch rectangular
8 x 8 inch rectangular
Remote
Mounted
Fan Converted
to Inline
Fiberglass
Ductboard
Correct Low
Sound Installation
(with built-in damper)
Keep duct
runs short.
OR
WALL CAP*
ROUND
(with built-in damper)
ELBOWS*
Flex Duct
Connections
Fan Mounted
Directly Overhead
Incorrect
ROOF CAP*
®