I am replacing the original shower extractor fan with a new one in the loft above a fully enclosed (floor to ceiling, wall to wall) shower cubicle. Can I put the ceiling pull switch just outside the cubicle in zone 2 or does it have to be at least 60cm away? Also can the 3 pole fan isolating switch be fitted out of reach in zone 2 up near the ceiling (above 2.25M) or does this have to be outside the bathroom?