What type of environment should be avoided when filling EANx tanks?

When filling Enriched Air Nitrox (EANx) tanks, it is crucial to avoid contaminated or uncontrolled environments because these settings can introduce oil, dirt, or other impurities into the tanks. EANx contains a higher percentage of oxygen than regular air, and contaminants such as oil can pose serious safety risks. Oil and high concentrations of oxygen can react in hazardous ways, increasing the risk of fire or explosion. Ensuring a clean and controlled filling environment is essential to maintain the integrity of the gas and prevent potential accidents.

The other environments mentioned do not present the same level of risk. For instance, well-ventilated areas with high humidity are generally safe if the humidity does not lead to water contamination. Open water surfaces and private home garages can also be safe under the right conditions, though precautions should still be taken to ensure they are free from contaminants. Maintaining a clean environment is a key operational safety practice when handling gases enriched with oxygen.