Greenwood Centrifugal Surface Mounted Low Voltage Bathroom Fan With Timer, Humidistat & Pullcord - SF90SVIHT vent-axia 'X' suffix models also have

'X' suffix models also have powered electric anti-backdraught shutters 258312

IPX4 Protection

VASF100B Silent Fan Basic 2 Year warranty

So if you have a R90B then this fan is its direct replacement and it will fit in the same space as your existing product and ducting

When no more movement is registered within the room

Greenwood Centrifugal Surface Mounted Low Voltage Bathroom Fan With Timer, Humidistat & Pullcord - SF90SVIHT vent-axia 'X' suffix models also haveThe SF90SVIHT is a Low voltage surface mounted centrifugal fan with humidistat and run on timer. Humidstat fans have a sensor in them. This detects moisture in the air. When a set humidity point is reached the fan will switch on. There are two types of sensor Traditional and Digital Intelligent. Traditional. Work by having a fixed humidity level which, when reached, the fan activates. Traditional humidistats work well but as natural levels of humidity