I bought a flat a year ago and i was informed that i need to fit an extractor fan in my kithen. The problem is my flat is over 100 years old and it is built with old stone so the walls are really thick. I have a cooker hood at the moment but it hasn't been fitted up with a pipe to the outside wall or the roof. Would i be best getting a wall mounted extractor fan or getting someone to fit my cooker hood up. Also is this just a normal electrican that would do this?