FKD 12 Engineering Data

Typical Specifications for Model FKD
Inline Duct Fans
Supply, exhaust or return air inline fans shall be of the cen-
trifugal, direct driven type.
Construction
Fan housing shall be constructed of heavy gauge galvanized sheet
metal. Fan shall be supplied with externally mounted electrical
terminal box with pre-wired terminal strip connections. Integral
disconnect switch shall be provided when specified.
Motorized impeller shall be a totally enclosed external rotor
type, Class F insulation. Single phase motors shall be perma-
nent split capacitor type. Three phase motors shall be dual
wound for 230V or 440/460V. All motors shall be a perma-
nently sealed self lubricating ball bearing type. Motors shall be
equipped with automatic reset thermal overload protection.
Motors shall be acceptable for continuous duty. Sufficient serv-
ice factor shall be provided to ensure long maintenance free
operation over maximum load conditions.
Fan wheel shall be of the mixed flow centrifugal type with a well
designed inlet venturi for maximum performance. Motorized
impeller shall be both statically and dynamically balanced as one
integral unit to provide for vibration free performance. The
FKD14XL through FKD18 impeller shall be molded of high density
polyamide resin. While the impellers of the FKD8XL through
FKD14, FKD18XL, & FKD20 shall be constructed of aluminum.
Performance
Fan air flow and sound performance shall be based on tests
conducted in accordance with AMCA Standard 210 and 301
and shall be licensed to bear the AMCA Certified Ratings label.
Code Approval
Fan shall be tested and approved by UL and CSA (or equals)
for safety.
Fantech, Inc. and Fantech
Limited certifies that the FKD
Series shown herein is licensed
to bear the AMCA Seal. The rat-
ings shown are based on tests
and procedures performed in
accordance with AMCA
Publication 211 and AMCA
Publication 311 and comply with
the requirements of the AMCA
Certified Ratings Program.
Mounting
All FKD Series fans can be mounted either horizontally, vertically or
at any angle. Fan mounting options include suspending the unit with
neoprene or spring hanging isolators or horizontal surface mount-
ing the unit with neoprene or spring base isolators. The fans may
also be secured to a vertical surface using angle brackets and vibra-
tion isolators.
Speed Controllability
Due to the excellent heat dissipating characteristic of the external
rotor motor, all FKD Series fans are 100% speed controllable
through voltage reduction. Fantech offers single phase solid state
speed controls for single phase FKD fans. Fantech also offers pro-
portional output controls for automatic fan operation and energy
management systems for single phase and 3 phase units.
System Balancing
Rather than adjusting belt tension, system balancing is achieved by
measuring the system flow or pressure and adjusting the fan per-
formance by “dialing-in” or setting the fan speed with a variable volt-
age or step transformer control. This control flexibility allows the
system to be adjusted to exacting specifications. Speed Control
performance regulation also eliminates the need for correct belt
alignment and tensioning as well as maintenance associated with
belt drive systems. Speed controls may also be used as secondary
steps for multiple speed systems. By using the appropriate con-
tactor, fan speed can be manually or automatically switched from
high to low and back again.
Fantech FKD Series 3
Performance Data
Air Performance Data
FKD Series air performance data has been presented at
five voltages representing a percentage of full line voltage. Additional
performance can be interpolated between the charted test points and
achieved using a variable voltage control. For additional assistance
determining fan operation at intermediate voltages/rpm, please con-
tact Fantech’s engineering department.
Sound Data
Sound data is presented in eight full octave bands as fan inlet sound
power - L
wi
, dB; total fan inlet sound power L
wi
, dB(A); and in fan
inlet sone levels. Silencers for additional attenuation of sound trans-
mitted into the duct are available.