Hooked up the air supply knife valve and temporarily attached the fan to bring in fresh air to the shelter project. Some rebar added, need 'a lot' more before lowering the door frame down. I managed to separate the bunker door from its frame, found that the hinges actually have roller bearings on them for ease of opening. Separating the two makes it a lot lighter to handle, I believe together it weighs about 600 lbs, the front and rear door panels are 3/8" steel, and that's before I pour lightweight concrete in the door core after its totally installed. The white 4" pipe is "t" for the sewer hookup to the pump-up toilet.