A cost effective one way naturally ventilated lightweight greenhouse with enhanced structural stability to withstand forces due to high wind flows is disclosed herein. The greenhouse of the present invention is more effective than heavy duty structures which are presently in use. The greenhouse structural configuration provides multi-bays having one-way ventilators formed by the opening between the lower roof and the upper roof of reduced slope with angles in the range of 100 to 250 and / or reduced ridge-height applied to selective, or specifically only to the outer side bay(s), compared to inner bay(s) that have normal / conventional slope angles and / or normal ridge height.
