Naturally ventilated greenhouse – best suited for areas where temperature ranges between 15^oC to 30^oC. The structure should have a provision of sufficient number of openings for ventilation. The percentage of ventilation will be up to 60% of the floor area depending upon climatic conditions. The openings may be side wall vent or roof vent or both to exchange air (hot/cold) flow inside the greenhouse. During the summer period the openings are provided need to ensure efficient air movement and should be fully airtight during winter period