Being able to find Expired Respirators in Arc Raiders is part of the Trophy Display Project. Specifically Stage 2: Soaring Menaces, where you'll need three of them to complete the second stage. Arc Raiders Expired Respirator location(Image credit: Embark Studios)Arc Raiders Expired Respirators are found in medical areas, as listed in our Arc Raiders Loot Cheat Sheet. The best way to find Expired Respirators in Arc Raiders then, is to make a beeline to the Testing Annex, head up to the first floor and check all the scientific/medical looking rooms. Three short trips like that and you'll have this part of the Arc Raiders Trophy Cabinet Project ticked off.