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THE ORDER: EVERYTHING MACHINE DESIGN LIBRARY Entry 4471-R: Personal Respiratory Unit, Mk. II (field name: "breather") Classification: Expedition kit, unrestricted · Rev. C, 2026 Purpose Supplemental breathing support for crew outside sealed structures on Prox while the terraforming phase is under way and oxygen levels in the open air are still unstable. Components     •    Mask: black hard-shell polymer half mask with twin exhalation vents. Its band hooks over the head like a headset.     •    Hose: ribbed, 70 cm.     •    Concentrator: 1.6 kg. Worn at the hip, between the shoulder blades, or slung under outer clothing. Has one status light: green, amber or red. Modes     •    FILTER: removes dust and smoke. Adds nothing to the air.     •    ASSIST: adds oxygen automatically when the outside air thins below safe levels. Runs about 14 hours on a charge. Warnings     •    Thin air: the early signs look like ordinary fatigue: sluggishness, poor judgment, headache.     •    r e d s 1 g n s: blue lips, confusion, or a companion who cannot be roused. Any one of these, or a red status light, means switch to ASSIST at once and move toward shelter. If you wait for red signs, you have waited too long.     •    Rich air: ASSIST mode becomes an ignition hazard. Hair, fabric and dry vegetation catch easily and burn with unusual speed and heat. Switch to FILTER.     •    Field indicator: if no instruments are available, a candle flame gives a rough reading. A flame that gutters or shrinks means the air is thinning. A flame that burns tall, bright and fast means the air is rich.     •    This unit does not replace adapting to the air. It is not for permanent wear. Print notes Fuel cost per print is negligible. Issue one per crew member, plus 20% spares. Atmospheric parameters: Dr. G. Ackermann · Scan: A. Ruiz