Yes the fan will need a triple pile isolator installed, for maintenance purposes and isolation when the need arises.

Does extractor fan have to have isolator switch?

Answer: The provision of isolating devices for extract fans in bathrooms or shower rooms is not specifically addressed in BS 7671. A fan isolator mounted adjacent to the fan would fulfill the requirement for switching off for mechanical maintenance. ... The switch need not necessarily interrupt the neutral conductor.

Does extractor fan need RCD?

All circuits in a bathroom must be protected by a RCD (Residual Current Device). They will need to be connected to the consumer unit and protected by an RCD. ... An extractor fan is essential and will help cut down steam in the bathroom.