EANx (Enriched Air Nitrox)
Definition
EANx, or Enriched Air Nitrox, is a breathing gas mixture with more oxygen and less nitrogen than standard air.
More on EANx (Enriched Air Nitrox)
EANx, also known simply as Nitrox, typically contains 32% or 36% oxygen (compared to 21% in regular air), which reduces nitrogen absorption during dives. This allows for longer bottom times and shorter surface intervals, especially within recreational depth limits. However, EANx introduces the risk of oxygen toxicity at shallower maximum operating depths (MOD). Divers must analyze their tanks before each dive and stay within the prescribed depth limits for their gas mix. Nitrox certification is required to dive with EANx.
Frequently Asked Questions
EANx reduces nitrogen absorption, which extends no-decompression limits and decreases post-dive fatigue. It’s especially useful for repetitive dives.
Most recreational divers use EAN32 (32% oxygen) or EAN36 (36% oxygen), offering good NDL advantages while maintaining manageable MODs.
Not inherently. It reduces nitrogen risk but introduces oxygen toxicity hazards if used improperly. Proper training is essential.
Yes. A Nitrox certification teaches you to calculate MOD, analyze tanks, and plan dives safely with enriched air.
Only if your computer allows setting the oxygen percentage. Most modern models support Nitrox and let you adjust PPO2 alarms.