VILPE ECo roof fans can be connected to the building's technology system if the system has the capability to control rotation speed with 0–10 V DC voltage. An alarm can be provided using the VILPE ECo Monitor operation monitor. The operation monitor emits an alarm as output data if the rotation speed falls below 200 rpm.The pulse data received from the VILPE ECo roof fan can also be connected to the building’s technology system, in which case alarm limits can be integrated into this system. The pulse data is generated by an open collector, with a maximum input voltage of 47 V. This must be checked with the system supplier. There is one pulse per revolution of the roof fan, and the alarm limit can be set at various values (e.g. 300 rpm).NOTE! Electrical installations may only be carried out by professional electricians.