hi, If using an 'in-duct' type of fan then fully out of bathroom zones ie one with 'elephant trunk' flexy duct both sides of fan which is mounted on rafters, my favourite type!
if fitted direct in ceiling then could even be in Zone 1!
don't know of any limitations on position of fans regarding windows only zones, but if fitting any fans in bathroomthen Part P applies to all types except first where no electrics in bathroom at all!!
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!