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#oxygen #oxygen tank #air supply #scuba diving #underwater breathing #diving gear

😷💨🫁

#breathing apparatus #rotaripser #SCBA #air supply #personal protective equipment #dräger safety

🧑‍🚒🫽💨

#SCBA #firefighter mask #breathing apparatus #oxygen mask #air tank #emergency services #rescue gear #air supply

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#heating ducts #cooling ducts #HVAC system #air supply #air return #conditioned air