In the parallel method fans are hanging in the middle on both side of the central path direction the front gables. This method is very suitable by space treatment with LVM since it provide good distribution of the mist. For optimal climate the serial method is the most suitable. In the serial method more ventilators with lower capacity are used, such provide a convenient quite air movement that is better for the crop in situation where long-term air circulation is needed. Ventilators hanging in a row after each other’s provide the most optimum air displacement.