What is the main safety risk associated with working in confined spaces like inside a boiler?

The primary safety risk when working in confined spaces, such as inside a boiler, is oxygen deficiency. Confined spaces often have limited access to fresh air, which can lead to a reduction in available oxygen levels. This condition can pose serious health risks such as incapacitation and even unconsciousness, which can be fatal if not addressed promptly. It’s crucial for workers to monitor oxygen levels and use appropriate ventilation or respiratory protection when entering these areas to ensure safety.

While low visibility and high temperatures can be concerns when working in confined spaces, they are secondary to the immediate life-threatening risk of reduced oxygen levels. Noise pollution may be a consideration in some environments, but it does not present as critical a risk as inadequate oxygen, which can swiftly lead to dire consequences.