Wall fan installation doesn't require expert intervention but requires the use of correct tools to do it right. Just make sure you are using a balanced and stable step stool while installing wall fan if the mounting is beyond your reach.________________________________________ You may also need to drill through the wall to fix the base on which the wall fan will be installed. Wall fan installation takes a couple of hours. Common problems with wall fan are wall fan making noise, wall fan regulator not working, wall fan not turning-on, wall fan vibrating etc.