In smaller sized greenhouses, a manual system opened and closed by hand could be installed. These work simplest when the screen materials is backed by a track system.

Start time – when in the morning will the screen system start operation
Stop period – when in the afternoon will the display system stop operation
Light level – in what light intensity will the screen become activated either to open up or close
Maximum/minimum temperature – what exactly are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this models the percent open or close Motor Gearboxes For Greenhouse placement under different conditions such as early on a winter early morning to reduce thermal shock or through the summer to provide better shading. The gap measures and speed of movement can be controlled in a few systems.
Time delay – below changeable climate this avoids frequent opening and closing
Wind speed – To lessen warmth loss, the screen could be closed early under high wind speed conditions
Snow detection – this can open the screen and turn on the heat when it begins to snow.
The typical system uses nylon monofilament or stainless steel cables to support the screen material. The screen material can possibly 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 moves the industry leading of the screen material. Control is usually either with a manual switch or electronic controller.

Based on the over, the grower is required to enter the following parameters into the controller:

A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.