Fan Inlet Connections - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Recommended Bearings 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.
Table 2: Suggested Fan Bearing Lubrication Intervals
Interval
(months)
Heavy duty in dirty, dusty locations; high ambient
1 to 3
temperatures; moisture laden atmosphere; vibration.
12 to 24 hours per day, heavy duty, or if moisture is
3 to 6
present
8 to 16 hours per day in clean, relatively dry
6 to 12
atmosphere
12 to 18 Infrequent operation or light duty in clean atmosphere
Table 3: Grease Manufacturers
Manufacturer
U.S. Electric Motors
Chevron U.S.A. Inc
Mobil Oil Corporation
Texaco, Inc.
Amoco Oil Co.
Exxon
Shell
10 Downblast Centrifugal Roof Exhaust
Type of Service
Grease (NLGI #2)
Grease No. 83343
Chevron SRI Grease #2
Mobilith
Mobil 532
Premium BRB #2
Texaco Multifak #2
Rykon Premium #2
Unirex N2
B Shell Alvania #2

Fan Inlet Connections

In order to assure 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.
Poor
Dampers must open fully.
Use motorized dampers in
low airflow applications to
reduce losses.
Good
Provide uniform airflow at
fan inlet and through the
damper to assure optimum
performance. The curb
cap should be three wheel
diameters from the radius.
Use turning vanes in duct
when possible.
Poor
Avoid sharp turns or
entrance conditions which
cause uneven flow. Use
turning vanes in elbows to
reduce adverse effects.
Good
Provide uniform airflow at
fan inlet to assure optimum
performance.
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