Why not? You can remove the fuses for isolation. You could even use a
lock off kit for extra protection should you need to provide further
protection when working on the fan or heater (which in real money means
if you have to swap them).
I suggest that they are placed close to a loft hatch.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.