The device also may be constructed in different sizes. System is based on a combination of memory metal and constant tension springs. Opens and closes venetian blinds. No motor required. Reacts to temperature.
Components are readily available and simple to assemble.
Also patented in several European countries. Skylight prototype has been operational for more than two years. Non Toxic insecticides, completed LD50's, eye irritation studies completed. Greenhouse and Field data available. Low cost product, very effective.