The design and colour of machinery components that move in the field of vision must be such as to prevent eye fatigue.Pieces of machinery that give off cuttings, dust, smoke, vapour or gas shall be designed as to prevent hazardous spreading of these substances. If a closed process cannot be used, the machinery shall be designed so as to allow for the connection of suction heads and pipes. Suppliers of machinery shall be able to deliver appropriate suction heads for fume extraction and specify fume extraction fan capacity where such a fan is not included in the machinery. On machinery where fume extraction is always needed during production, the suction heads shall be provided as part of the machinery.