I posted an example before of the massive chimney hole that lives in many northern homes. This one is a little different.
The previous post was of a gable end chimney that had been framed in when a previous homeowner built a garage and great room over the garage.
This is a more typical chimney, centrally located in the house and framed in. This is a potentially more dire issue since ‘centrally located’ means warm interior air on all sides. In any case, this homeowner is losing a ton of heat through this chimney chase.