Ventilating fans; fans [air-conditioning]; fans [air-conditioning]; fans for air conditioning apparatus; ventilators for heat exchangers; hand drying apparatus incorporating fans; fans for gas extractors; chimney blowers; fans for exhaust extractors; hoods incorporating extractor fans; fans for fume extractors; electrically powered fans for ventilation purposes; motorised fans for ventilation; electrically powered fans for ventilation purposes; electrically powered fans for ventilation purpos...