I never had oil heat before, so I'm looking for some info please. The furnace was installed 2 years ago in a closet space in the hallway of a mobile home. When I bought the place, there was a piece of sheetrock that had been removed from above the furnace. I don't know whether they just didn't feel like putting it back, or if the furnace really needs to have open space above it. Anyway, my brother found it and just screwed it back in place. Now I'm worried that it was taken off for a reason. Any help? Thanks.....