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MVA 02 rev 5 - December 2017
With regard to guards to be fitted to ducts, in compliance with the design project, they must prevent access
to parts of the fan and its accessories that could cause injuries. They must also be sufficiently robustly
constructed to resist the stresses generated by the machine and environmental conditions.
FVI
invites users and/or system designers to design, construct and install guards in conformity with the
criteria of the
UNI EN ISO 12499 standard.
CAUTION:
Even with guards installed (regardless of the conditions of supply or installation), the fan may
be dangerous due to the effects of indrawn or moved air.
Depending on the dimensions of the fan, this type of danger may even CAUSE DEATH.
The risk of being crushed against the intake grille may be fatal or may cause serious injuries
(crushing of body parts, unconsciousness).
CAUTION:
It is advisable to adopt precautions that prevent access to the room containing the fan while it
is operating, or to keep persons away with fixed guards that maintain a safe distance from the
intake opening.
For details consult the UNI EN ISO 13349 and UNI EN ISO 12499 standards.
WARNING:
Check the efficiency of all guards every month. In case of wear, damage or breakage, replace
them immediately.
Guards must be fixed securely in position using fixings that are not slackened by vibrations, and that require
the use of a tool for their removal.
CAUTION:
On starting and in compliance with programmed maintenance intervals, check that nuts and
bolts are correctly tightened. Monitor vibration levels with a vibrometer, and establish an alarm
threshold (see paragraph 12.3).
It is always the responsibility of the installer to guarantee that there is an adequate level of protection against
the risk of accidental contact with moving parts.
The installer and the user must also take other types of risk into consideration, and in particular those
deriving from the entry of foreign bodies and the intake of explosive, inflammable or toxic gases or gases at
a high temperature.
The risks involved in maintenance operations must also be taken into consideration. It must be possible to
perform these operations in conditions of maximum safety, by isolating the fan from the motor or by taking
other suitable precautions.
CAUTION:
A safety procedure for access to the fan must be compiled, taking into consideration the
indications provided by the manufacturer, information deriving from the analysis of risks at the
installation point and safety requirements in workplaces.
