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MVA 02 rev 5 - December 2017
3.8
Other risks related to fans pursuant to UNI EN ISO 12499
The specific risks defined below are those deriving from mechanical aspects of the fan.
A person may be injured as a result of:
a) being dragged between a moving part and a fixed part, for example a impeller and the
casing or some other fixed part of the fan;
b) being dragged between two moving parts, for example a drive belt and a pulley;
c) being dragged into the fan through the air intake, with consequent contact with the shaft or
impeller;
d) contact with a moving part, such as the impeller;
e) ejection from the fan exit of fragments deriving from the introduction of residual solids or
liquids extraneous to the process, or deriving from the suction environment;
f) an object drawn into the fan mouth and ejected at high speed from the fan intake or exit;
g) structural defects of fan components;
h) contact with fan surfaces at dangerous temperatures, for example below -20°C or higher
than +50°C;
i) when working with hot fluids, there may be losses of jets of hot fluid from the transmission
shaft hole that may cause burns or scalds.
l) the potential harmfulness of the fluid being moved or the presence of substances that in
case of leaks may be hazardous;
m) a hazard deriving from motor overspeed, which may cause the breakage of machine parts;
n) the intake of air at abnormal temperatures higher than those recommended may cause
structural deformations, malfunctions and hazards.
3.8.1
Specific risks with fans during installation
The user must provide a well-levelled fixing surface. Incorrect levelling may cause abnormal fan
vibrations that over time could cause deformation and/or breakage, with the detachment of fan parts,
representing a hazard for exposed persons that may even be fatal.
The user must also arrange electrical connections for the fan casing or structure to the main electrical
grounding system of the place of use, to prevent any formation and accumulation of static electricity.
All guards installed must remain correctly connected to the fan with all relative fasteners (bolts, nuts,
etc). The removal of one or more fixing points may impair the functionality and solid fixing of the guard.
Fans supplied as standard versions
are not
intended for use in potentially explosive environments.
The place of installation of the fan must be kept clean. Any spills of oil or water not due to the fan must
be cleaned away as quickly as possible.
The minimum installation distances defined in this manual must always be respected to guarantee
correct operation and the absence of additional risks. Incorrect positioning could impair the correct
operation of the fan.
3.8.2
Specific risks with fans during maintenance
During maintenance and cleaning operations on the impeller, take great care with rotations of the
impeller, which could cause trapping or cutting injuries against fixed parts of the casing.
A programmed maintenance schedule for the fan must be prepared and applied, so as to prevent
mechanical failures or breakages caused by wear or inadequate maintenance (see paragraph 12.3).
