ÖNORM EN 14986

This document specifies the constructional requirements for fans constructed to Group II G (of explosion groups IIA, IIB and hydrogen) categories 1, 2 and 3, and Group II D categories 2 and 3, intended for use in explosive atmospheres. This document specifies requirements for design, construction, testing and marking of complete fan units intended for use in potentially explosive atmospheres in air containing gas, vapour, mist and/or dusts. Such atmospheres can exist inside (the conveyed atmosphere (flammable or not)), outside, or inside and outside of the fan. This document covers mechanical equipment, in particular fans. The “type of protection” as specified in EN ISO 80079-37:2016 is constructional safety. This document is applicable to fans working in ambient atmospheres and with normal atmospheric conditions at the inlet, having - absolute pressures ranging from 0,8 bar to 1,1 bar, - and temperatures ranging from -20 °C to +60 °C, - and maximum volume fraction of 21 % oxygen content, - and an aerodynamic energy increase of less than 25 kJ/kg. This document can also be helpful for the design, construction, testing and marking of fans intended for use in atmospheres outside the validity range stated above or in cases where other material pairings need to be used. In this case, the ignition risk assessment, ignition protection provided, additional testing (if necessary), manufacturer's marking, technical documentation and instructions to the user, clearly demonstrate and indicate the equipment's suitability for the conditions the fan can encounter. This document does not apply to: - group I fans (fans for mining); - explosion group IIC (other than hydrogen); - category 1D fans; - cooling fans or impellers on rotating electrical machines; - cooling fans or impellers on internal combustion engines, vehicles or electric motors.