The new Helios Ultrasilence® ELS mix & match modular fan range is the our most popular bathroom extract fan. They are space-saving and low-priced, energy saving with revolutionary & intelligent electronics. A wide variety of model options include interval function, overrun timer, humidity controlled operation, automatic PIR sensor etc. All of these fans are IP X5 and suitable for all zones of the bathroom except zone 0 (see building regulations). All fans fit all casing options.