ATEX is the French abbreviation for explosive atmospheres and is a European Directive that sets the standards for fans intended for use in those atmospheres. It is designed to ensure the safety of workers and the prevention of accidents in environments where there is a risk of explosion. It covers a wide range of industries and environments where flammable gases, vapours, liquids, or combustible dusts may be present. ATEX certification involves rigorous testing and assessment of products to ensure they meet the necessary safety requirements with certification being essential to sell equipment for potentially explosive atmospheres within Europe.