Steel Grease Fan
9
Table 3: Grease Manufacturers
Manufacturer
Grease (NLGI #2)
U.S. Electric Motors
Grease No. 83343
Chevron U.S.A. Inc
Chevron SRI Grease #2
Mobil Oil Corporation
Mobilith
Mobil 532
Texaco, Inc.
Premium BRB #2
Texaco Multifak #2
Amoco Oil Co.
Rykon Premium #2
Exxon
Unirex N2
Shell
B Shell Alvania #2
Table 2: Suggested Fan Bearing Lubrication Intervals
Interval
(months)
Type of Service
1 to 3
Heavy duty in dirty, dusty locations; high ambient
temperatures; moisture laden atmosphere; vibration.
3 to 6
12 to 24 hours per day, heavy duty, or if moisture is
present
6 to 12
8 to 16 hours per day in clean, relatively dry atmosphere
12 to 18
Infrequent operation or light duty in clean atmosphere
Recommended Bearing Lubrication
Frequency in Months
Note:
If unusual environment conditions exist (extreme
temperature, moisture or contaminants), more frequent
lubrication is required.
A good quality lithium base grease, conforming to NLGI
Grade 2 consistency, such as those listed in Table 3
may be used.
Dampers must open fully.
Use motorized dampers in
low airflow applications to
reduce losses.
Avoid sharp turns or
entrance conditions which
cause uneven flow. Use
turning vanes in elbows to
reduce adverse effects.
Provide uniform airflow at
fan inlet to ensure optimum
performance.
Provide uniform airflow at
fan inlet and through the
damper to ensure optimum
performance. Curb cap
should be three wheel
diameters from the radius.
Use turning vanes in duct
when possible.
Fan Inlet Connections
In order to ensure proper fan performance, caution
must be exercised in fan placement and connection to
the ventilation system. Obstructions, transitions, poorly
designed elbows, improperly selected dampers, etc.,
can cause reduced performance, excessive noise and
increased mechanical stress. For performance to be as
published, the system must provide uniform and stable
airflow into the fan.
Good
Poor
Poor
Good
