I have a door sitting in the garage that was taken off our house during some previous renovations. I went to move it and the bugger weighs maybe 50-60kg. It looks like a normal white internal door. Is it a fire door of some sort, because I figure it must have some steel in it? There are no markings on it, other than a "Hume Doors" sticker. I think I will sell it, but I'm not sure how to describe it!