Curtain-sided houses are naturally ventilated houses with cross-ventilation from both sides. Height-adjustable sliding sandwich panels are fitted along the sides of the building.
More and more livestock farmers are coming to regard this system as a halfway house between conventional housing and the PigPort. The animals are housed indoors and stand on slatted floors as in conventional pig housing. The curtains are left open during warm weather to provide an optimum supply of fresh air. In the winter and at night, the fully automated, insulated curtain elements keep the house snug and warm. Used air makes its way naturally to the top of the building, where it escapes.
This form of housing can be built as a single-area unit or with rows of stalls. Like the PigPort house, the curtain-sided house uses very little energy.