Yes but if your fireplaces manual says you cannot install an insert in it the quad manual can't over ride that. And most say you can'tWell, now that I'm digging through the installation manual for the Quadrafire Expedition II, it states that the insert is tested and approved for installation into a zero-clearance pre-fab unit. It does state that the top flue liner should not reduce air-flow for the existing air-cooled chimney, so I still think this part needs to be corrected.
Pg. 16
Manual