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SFD and SFB Specifications
Model SFD Direct Drive
Utility Fans
Supply, exhaust or return
air fans shall be of the
direct drive utility fan type,
in AMCA Arrangement
4 with a single-width,
single-inlet housing,
in clockwise or
counterclockwise
rotation as specified.
The housing shall be constructed of heavy-gauge
galvanized steel with lock formed seams permitting
no air leakage. The housing shall be easily rotated
in the field to any of the eight standard discharge
positions. Housing supports shall be constructed of
heavy-gauge galvanized steel to minimize vibration
and rigidly support the motor and wheel.
The fan wheel shall be of the forward-curved type
and shall be constructed of heavy-gauge aluminum.
Wheels shall be statically and dynamically
balanced. The wheel cone and fan inlet cone shall
be carefully matched for maximum performance
and operating efficiency. Motors shall be heavy-
duty ball bearing type matched to the fan load
and furnished at the specified voltage, phase and
enclosure.
All fans shall bear the AMCA Air Performance seal.
Utility fans shall be model SFD (with forward-
curved wheels) as manufactured by Greenheck Fan
Corporation of Schofield, Wisconsin, USA.
Model SFB Belt Drive Utility Fans
Supply, exhaust and return air fans shall be of the
belt driven utility fan type in AMCA Arrangement
10 with a single-width, single-inlet housing, in
clockwise or counterclockwise rotation as specified.
The housing shall be constructed of heavy-gauge
steel with airtight lock formed seams. The housing
shall be easily rotated in the field to any of the eight
standard discharge positions. Housing and bearing
supports shall be constructed of welded steel
members to prevent vibration and to rigidly support
the shaft and bearings.
Model SFB fan wheels shall be of the forward-
curved type, constructed of heavy-gauge steel with
uniform stamped steel blades.
Wheels shall be statically and dynamically
balanced. The wheel cone and fan inlet cone shall
be carefully matched for maximum performance
and operating efficiency.
Motors shall be heavy-duty, ball bearing type,
matched to the fan load and furnished at the
specified voltage, phase and enclosure. The fan
shaft shall be ground and polished solid steel
mounted in heavy-duty, sealed, pillow block ball
bearings. Bearings shall be selected for a minimum
L
10
life in excess of 100,000 hours (L
50
average of
500,000 hours) at maximum cataloged operating
speed. Drives shall be sized for a minimum of
150% of driven horsepower. Pulleys shall be of the
fully machined cast iron type, keyed and securely
attached to the fan and motor shafts. The motor
pulley shall be adjustable for final system balancing.
All fans shall bear the
AMCA Air Performance
seal.
Utility fans shall be model
SFB (with forward-curved
wheels) as manufactured
by Greenheck Fan
Corporation of Schofield,
Wisconsin, USA.
