Yeah all installed now. The issue was when cutting the big hole I'd cut back too many of the lathes so the fixing points weren't lining up properly. I managed to use a couple of the holes for the air dams as fixing points too so all secure now. Have the heat version but air still feels pretty coldc out.What heat/fan speed you guys using?Hopefully you've got it installed now. I have lathe and plaster (more like contrete for me) and I just screwed through the plaster into, strips of wood. It's in solid now.