installing chimney liner with heatilator fireplace
I want to installi a chimney liner for a wood insert but my fireplace was built with a heatilator system. One expert I spoke with told me to simply "ovalize" the liner (six inch diameter) and push it through (and don't insulate that short section), then reform the pipe to round so that it will for the connector. Another expert told me that I need to "torch out" the heatilator smoke shelf in order to get a straight shot at the liner. Can anyone out there give me advice on which way to go on this? The torching seems like a lot of trouble compared to the ovalizing of the pipe. Thanks.