Central detection Carbon monoxide 4 areas. Maximum 16 detectors per zone. installation by 2 wire free architecture and no polarity. 3 programmable levels: ventilation, turbo ventilation and alarm (from 10 in 10 ppm) with independent relay outputs. Delay time of the beginning of programmed ventilation. Time between readings of a detector 25sec. Maximum distance of the detectors to the central 350m. After 2×1,5mm (no polarity). dimensions 488x195x85mm.