Curtain control is a common technique in breeding farms, so this option for both sides of the building with and integrated electrically backed up system inbuilt is perfect option. This secure curtain control automates from an internal battery, which triggers up and down on both sides. The assurance given from this equipment is that it guarantees ventilation in the building in case the farm is left without power and without the ability to operate the other ventilation equipment (inlets, motors, fans, chimneys,...).