Flue exhaust in chimney for furnace

What are the requirements for exhausting a 1992 Goodman 100,000 BTUH furnace flue exhaust pipe in a 1924 home thru the chimney? The furnace I inspected was installed with flex pipe and terminated about ninety percent of the way up the chimney. Also, the chimney was exhausting a wood-burning fireplace. As you can see by the pictures, no chimney cap was installed either. Thanks for the info.

Nothin’ about that whole fiasco is right an it needs a fixin’


Here’s another link: http://www.inspectapedia.com/chimneys/Shared_Chimney_Flues.htm

would need a liner for the wood stove also imho