Specs for an Old Trane Furnace

[bertroid]

Hi all,

I'm new to the forums and new to home ownership. My house was build in 84 and I think it has the original furnace(not sure because I purchase a foreclosure). I was just curious to read about more of the specifications of the furnace and cannot locate this info. Could someone provide me with a link, pdf file, or direct me where to look? Thanks for all your help. Below is a pic with some info found on the furnace.

The model # is
BLU108F936B1