🔍 Key Concepts

• Self-contained breathing apparatus (SCBA) use in emergencies (fire, toxic atmospheres) • How improper storage, poor donning, and lack of maintenance can each affect safety and efficiency • Why exam questions sometimes use inclusive options like “all of the above” and when that is or is not appropriate

💭 Think About

• For each option (stowing, donning, maintenance), ask yourself: Could doing this incorrectly realistically reduce how well the facepiece protects you and how easily you can breathe? • Think about real-life emergency use: In a smoke-filled space, which factors must already be correct before you put the facepiece on so that it seals and functions properly? • If only one factor were done correctly but the others were done poorly, would the facepiece still be considered safely and efficiently used?

✅ Before You Answer

• For each choice, check whether improper stowing could damage the facepiece or its sealing surfaces. • Consider whether incorrect donning could cause leaks, fogging, or poor visibility, affecting safe use. • Verify whether poor maintenance (cleaning, inspection, replacement of parts) could compromise the facepiece’s performance in an emergency.