All of them have the following advantages:
     - Protection against sun radiation and heat reduction in the greenhouse        construction. The screens accumulate and release heat and therefore they are        called “hot screens”. The heat exchange is between the air in the woven net and        the emitted and absorbed radiation by cooler elements under the screen (plants,        soil and etc). In this case the temperature of the leaves is identical to the        surrounding air temperature. The aluminium screens do not heat and therefore        are called “cold screens” Aluminium itself is known as an isolating material. Due        to the reflectivity of the aluminium net the sun radiation is reflected and returns        towards the sky instead of penetrating to the soil or to the plants;
     - Protection against freezing due to failure in heating system. In sunny days the        plants absorb much energy. During the night they release infra-red radiation.        When there are no barriers against the long infra-red waves, the plants loose        soon the accumulated during the day temperature. So the temperature of the        leaves is identical to the surrounding air temperature for a short time. In case of        failure in heating system of the greenhouse plants cannot survive without        screens.
     - Saving energy. The screens protect from losses of infra-red radiation. In this        way they save energy. Most of the energy losses (80%) in heated constructions        are at night. Thermal screens reflect the stream energy back to the plants and to        the soil. Thus the temperature in the greenhouse is effectively maintained. Up to        40% of the heating energy may be saved, depending on the type of screens and        other conditions in the construction. Thermal screens give the opportunity of        effective temperature control during day and night.
     - Light dispersion. The reflectivity of screens creates secondary radiation to the        plants and improves the light diffusion. The uniform scattered light is essential        for the photosynthesis quality.
     - Pest and insect penetration;
     - Prevention from condensation on screens and plants;
     - Due to net structure, screens are of high elasticity; they provide uniform shading        and light diffusion; controlled ventilation in greenhouse.