VELUX control unit KFC 305 for 2 VELUX smoke ventilation windows GGL/GGU (or 1 VELUX glass rooflight electric exit CXU, depending on local legislation, please consult your local VELUX Sales company). Connected windows can be easily opened and closed for fresh air by using a comfort ventilation switch. The KFC 305 also features a 72-hour battery back-up for added safety.
