Pouring aisles where hand shank ladles or crucibles are used:
- are no less than 40 cm (15 in) wide, when a maximum of 2 workers are pouring at a height that is less than 50 cm (20 in) above the aisle level,
- are no less than 60 cm (2 ft) wide, when a maximum of 2 workers are pouring at a height that is greater than 50 cm (20 in) above the aisle level,
- are no less than 90 cm (3 ft) wide, when more than 2 workers are pouring at any height.