Jason you have already received some excellent recommendations, we are revising the instructions that come with the hot air jacket to advise a few things:
* Keep the two 265 cfm fans installed and hook them to the Coal Trol
* Utilize a fan limit in conjunction with your furnace fan to ensure it doesn't run unless the temp is up to a preset level
* Run your furnace fan on low speed if it is a three speed fan or don't use it at all and use a 14" inline duct fan hooked to the fan limit and run on a rheostat to push air into the duct work at a speed matching the outside conditions (higher speed for colder temps and higher stove temps.
* Install a damper in the cols air return to allow regulation of the inlet air coming from the house
* If possible hook one of the inlets from the 265 fans on the stove (the one that faces out is easiest) to the upstream side of the cold air return to draw some of the house air through the stove.
We are also working on a new design hot air jacket that utilizes twin 490 cfm fans (hooked to the Coal Trol) that blow air up the side of the stove as well as the back. In the mean time all of you please keep up the good work on coming up with innovative ideas for getting the best out of the Hyfire/hot air jacket configuration.