Safety Trained Supervisor in Construction (STSC) Practice Exam 2025 - Free STSC Practice Questions and Study Guide

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Which factor does NOT contribute to the depletion of oxygen levels in confined spaces?

Ventilation

Ventilation plays a crucial role in maintaining oxygen levels in confined spaces. It introduces fresh air and helps remove stale air, thereby preventing the depletion of oxygen. Without adequate ventilation, oxygen levels can drop significantly due to various processes that consume oxygen.

Chemical reactions, respiration by individuals, and combustion processes are all activities that can consume oxygen in a confined space. Chemical reactions may involve the oxidation of materials, while individuals breathe in oxygen and exhale carbon dioxide, and combustion processes require oxygen to sustain a flame. Therefore, the presence of ventilation is essential for counteracting these processes, making it the factor that does not contribute to the depletion of oxygen levels in such environments.

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Chemical reactions

Respiration by individuals

Combustion processes

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