Aerovent IM-120 - Manual (Page 2)

Care and Maintenance
Good fan maintenance requires regular and systematic
inspection of all fan parts. Severity of the application
should determine frequency of inspection.
Regular fan maintenance should include the following:
1. Propeller — The propeller in an axial flow fan must
be kept reasonably clean if it is to perform prop-
erly. Fans handling fresh air for ventilating purposes
will seldom need cleaning. Fans exhausting process
air should be cleaned as required. Dirt or chemical
deposits will usually build up on a propeller evenly,
and they present no problem to performance or oper-
ation until they become thick enough to break away
in crust-like pieces. When this happens, the propeller
may be thrown out of balance and the resulting vibra-
tion could be serious. The dirt or chemical deposits
should be removed by solvent cleaning or scraping.
If the propeller has been coated, be careful not to
cut through this protective covering. If the propeller
shows excessive wear, it should be replaced imme-
diately. Refer to General Installation and Maintenance
IM-100 for proper procedure in removing and replac-
ing the propeller.
2. V-Belt Drive — Check V-belt drive for proper align-
ment and tension. See General Installation and
Maintenance IM-101 for instructions.
3. Fan Bearings — Lubricate the bearings (if belt driven).
Bearing lubrication instructions are detailed in IM-
100.
4. Screws and Bolts — Check tightness of all screws
and bolts throughout the ventilator assembly.
5. Stack Cap — Periodically check damper blades and
remove accumulated dirt. Check bronze damper bear-
ings for smooth operation.
5MPP04/07
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