SIRe is an intelligent and well designed low voltage control system which can be customised for each unique application and environment. SIRe is supplied pre-programmed with quick-release connections and is very easy to use and install.SIRe learns the requirements in the entrance it is installed in (ex. opening frequence and outdoor temperature). It has calendar function and selectable switch off at set temperatures for up to nine units. Because the fan speed is adapted, the sound level is optimised and is never higher than is necessary for comfort.There are three different levels with different functionality to choose from, Basic, Competent or Advanced..