Fronius MTG 400i K4 Instructions De Service page 29

Danger from contact with toxic welding fumes.
Serious personal injuries may result.
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Danger from operation without coolant.
This can result in damage to property.
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Danger due to
welding fumes
Danger due to the fumes produced during welding which contain toxic gases and
vapors.
Serious damage to health may result.
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WARNING!
Always extract welding fumes.
Ensure that there is a sufficient supply of fresh air. Ensure that there is a
ventilation flow rate of at least 20 m³ (169,070.1 US gi) per hour at all times.
In case of doubt, the concentration of noxious substances at the work stati-
on should be assessed by a safety engineer.
CAUTION!
Never operate water-cooled welding torches without coolant.
During welding, ensure that the coolant is circulating correctly – this will be
the case for Fronius cooling units if a regular return flow of coolant can be
seen in the coolant container of the cooling unit.
The manufacturer will not be liable for any damages due to non-observance
of the above mentioned points. All claims against the warranty are void.
WARNING!
Welding is not permitted without an extraction unit being switched on.
It may possibly not be sufficient just to use a fume extraction torch.
In this case, additional extraction should be installed in order to reduce the
concentration of noxious substances at the work station.
In case of doubt, the concentration of noxious substances at the work stati-
on should be assessed by a safety engineer.
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