Width of Bay: 9,10 m ; 9,60 m. Side Height: 2 m. Height at Ridge: from 4 m up to 6 m. Ridge Ventilation type: Stationary Vent, Simple Mobile Vent, Butterfly (double) Vent. Perimeter Ventilation type:Rolling Vent. Cover: Plastic film and semi-rigid materials. This kind of Greenhouse Construction is built with one single tunnel, with a variable length. The height at the bands gives this Greenhouse great air volume.