I'm surprised by the lack of refractory lining. Most ZCs have this extra layer of protection.
Sounds like an unsafe installation as it stands. The fireplace has been modified which is warned against in any insert manual. You will have to make this call on your own. It's untested territory. That deep face is going to compound problems with trying to align the liner with the insert flue outlet. A safer, better heating and perhaps easier install would be to put a freestanding rear-vent stove in front of this unit and run a liner up the chimney.
Well there you have it. Measure twice before buying anything. that deep face is going to present a challenge for the flue hookup.
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