Product Leaflet System 1-2-3 Natural Ventilation - Pigs The best system for loose sows Loose sows require natural ventilation. Funki is the ventilation firm in Denmark, with the most experience concerning natural ventilation. The fresh, calm ventilation presents the perfect environment for sows regardless of time of year and climate. With the adjustable flaps longitudinally to the overhead light ridge you are ensured a lifting power and a suction, as if fans were mounted in the ridge. It is best to choose the system with adjustment. We also supply with fixed flaps without adjustment. Air inlet Funki is very experienced with light inlets mounted in the wall. We calculate number and placing. No energy consumption No draught Less bedding consumption More light in the house Better gestation No service costs Easy to mount Nice loo