Final answer:
Extra ventilation or a respirator is necessary when cutting used metals to prevent the inhalation of potentially toxic heavy metals. Additionally, the use of oxygen in the cutting process creates a need for ventilation as it can lead to fire risks or the accumulation of harmful gases. The heat generated during cutting can also increase metal volume, raising pressure and explosion risk in an enclosed space.
Step-by-step explanation:
When cutting used metals, it's pivotal to employ extra ventilation and/or a respirator. The reason behind this is primarily due to the presence of heavy metals such as mercury, silver, copper, and zinc that may have toxicity and potential environmental risks. Many used metals can release these harmful substances in the air during cutting, which can be inhaled and cause serious health issues.
Additionally, the process of cutting and welding metals requires large quantities of pure oxygen. This increased oxygen volume can lead to a hazardous environment if not adequately ventilated, in terms of heightened fire risk or causing harmful gases to build-up.
Lastly, as metals are heated during the cutting process, their volume can increase due to the introduction of thermal energy. Without proper ventilation, this could raise pressure and risk of explosion, particularly in an enclosed space.
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