In smaller sized greenhouses, a manual system opened and closed yourself could possibly be installed. These work simplest when the screen materials is supported by a track system.
Start time – when in the Motor Gearboxes For Greenhouse morning will the display system start operation
Stop period – when in the afternoon will the display screen system stop operation
Light level – at what light strength will the screen end up being activated either to open or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this sets the percent open or close position under different circumstances such as early on a winter early morning to reduce thermal shock or through the summer to supply better shading. The gap actions and speed of movement can be controlled in some systems.
Time delay – below changeable climate this avoids frequent starting and closing
Wind speed – To lessen high temperature loss, the screen could be closed early under high wind speed conditions
Snow detection – this may open the screen and turn on heat when it starts to snow.
The typical system uses nylon monofilament or stainless cables to aid the screen materials. The screen 
material can either rest along with the network of cables or be suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that movements the industry leading of the screen materials. Control is either with a manual change or electronic controller.
Based on the over, the grower is required to enter the following parameters into the controller:
A climate station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.
