Which of the following conditions represents...

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Question 1 of 205eccef9ebacbc34ba4d464d7

Which of the following conditions represents a particular advantage of using a positive pressure type self- contained breathing apparatus in an atmosphere that is immediately dangerous to life or health?

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🔍 Key Concepts

• Positive pressure SCBA (self-contained breathing apparatus) vs. demand-type SCBA • What makes an atmosphere IDLH (Immediately Dangerous to Life or Health) and what protection is critical there • How air leakage behaves when the pressure inside the mask is higher vs. lower than outside

💭 Think About

• Which option describes something that is unique or especially important about positive pressure operation compared to other SCBA types? • In an IDLH environment, what is the biggest danger: running out of air, physical strain, or letting contaminated air get into the mask somehow? • If the mask seal is not perfect, what happens when the pressure inside is slightly higher than the outside atmosphere?

✅ Before You Answer

• Identify which choice deals directly with contaminated air entering or not entering the facepiece. • Check whether claims about cylinder operating time or equipment being lightweight/compact are universally true for all positive pressure SCBAs. • Confirm which option matches the safety principle of positive pressure: air should flow outward at any leak, not inward.

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