| WARNING Vaisala recommends preparing the balloon in a balloon-filling shed. The balloon-filling shed must be well ventilated so that possible gas leaks do not remain inside the shed, even in situations when there is no electricity. |
- The balloon-filling shed must be spacious enough for convenient handling of all balloon types in normal use.
- The door (or doors) must be wide enough to allow free passage of inflated balloon without the risk of, for example, touching sharp corners or other objects. The door must be on the lee side of the prevailing winds.
- Good ventilation must be provided also when the doors are closed.
- If hydrogen is used as filling gas, locally applied standards for electrical equipment, installations and zone classifications in the presence of explosive gas must be followed. For instance, all electrical installations, both permanent and temporary, must be of spark-proof construction. Regular inspections must be carried out.
- The inflation nozzle (Vaisala Filling Balance FB13) must be connected to ground through a metal plate, fixed to the floor, which in turn is permanently connected to a well-grounded piping or some other construction with good earth contact.