Firefighter Cylinder Firefighter Cylinder (SCBA Cylinder) – Overview A Firefighter Cylinder is a core component of the Self-Contained Breathing Apparatus (SCBA), allowing firefighters to breathe clean, compressed air in dangerous environments filled with smoke, toxic gases, or low oxygen levels. 🔧 Key Features Feature Description Name SCBA Air Cylinder Purpose Supplies breathable compressed air during firefighting and rescue operations Material - Steel (heavier, durable) - Aluminum (lighter) - Carbon fiber composite (lightest and most common today) Air Type Compressed ambient air (not pure oxygen) Capacity Common sizes: 6.8L, 6.9L, 9.0L Provides 30, 45, or 60 minutes of air (depending on use and cylinder size) Working Pressure - 2216 psi (153 bar) - 4500 psi (310 bar) – most common Weight Ranges from 6 to 10 kg (varies with size and material) Valve On/off valve with integrated pressure gauge and burst disc Safety Features - Pressure relief valve - Low-air warning alarm - Hydrostatic test markings