Confined space

What is the maximum allowable oxygen concentration in a confined space?
19.5%
21%
23%
25%
Which of the following gases are commonly found in confined spaces?
Carbon monoxide
Nitrogen
Oxygen
Methane
Hydrogen sulfide
What is the purpose of a confined space entry permit?
What is the recommended minimum ventilation rate for a confined space?
1 air change per hour
2 air changes per hour
3 air changes per hour
4 air changes per hour
Which of the following is an example of a physical hazard in a confined space?
Falling objects
Toxic fumes
High noise levels
Slippery surfaces
Electrical hazards
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