Mar 20th, 2010, 12:06 PM
We have a couple of aluminum whiirlybirds on our roof for ventilation. These have been up there for around 6-7 years. The question that I have is, do the bearings in these things ever need to be greased or lubricated? Some days when it gets super windy I always have this feeling that the bearing might fail because the thing is spinning so fast. Has anyone ever have one of these things fail on them?