The Helios Fans KWL 45 SNU is an extension unit used to increase the capacity of the KWL 45 STS-UP control set from 6 to 8 ventilation units. It requires a 230 V AC input at 50/60 Hz and delivers a 12 V DC output at 1.9 A. Designed for flush mounting in insulated walls, this module ensures compact and discreet installation. The output voltage adheres to SELV (Safety Extra Low Voltage) protection class 3, providing a safe and reliable power supply for extended control configurations.