1. Thermal screens:

Thermal Screens are closed during the night when the outside temperature exceeds a value with respect to the interior, or when the temperature in the heating circuit exceeds a threshold, completely closing.

If the relative humidity exceeds a certain value, they are forced to open proportion to a set range between 1 and 30 centimeters, to reduce moisture condensation on the ceiling that is cold, or for the air renewal by opening the ventilation a little.

A second option is not to close them at night, but in a predawn time, by schedule or by light level (lux) so that the screen is then opened gradually to prevent temperature sudden drops in greenhouses by ventilation needs.

2. Screens Shading:

The opening of these screens depends on time program and the setpoint of two levels of radiation and interior temperature, one for opening and one for closing. Further closing the screen, the greenhouse temperature can rise, in which case the screen is open to some extent so that ventilation is benefited.

3. Screens of photoperiod:

They are used to increase the duration of the "night" flower crops with the aim of his forced. The screen must completely cover the greenhouse. Its regulation is performed according to schedule.