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To use a self-contained breathing apparatus (SCBA): tighten all straps after securing the backpack-style apparatus on your shoulders; turn the knob away from you until a bell sounds to activate oxygen flow; fit and tighten the mask securely so air does not leak out, and attach its line to confirm oxygen is flowing before breathing. The author has extensive experience with SCBAs from training daily with them at Tolles Technical Institute, where they are critical firefighting equipment.







