I just bought a new channing with the top you are talking about,sorry I cant put a picture on here yet, but it is a full size top with a cut out to go over the exhaust pipe and then a 6" take off in front of that.
The take off is in the center of the top. It still has an opening that will blow air out the front but I am going to tape mine off so all the air goes up through the take off. In a day or so I am going to duct mine into my cold air return on my forced air furnace and use a spring loaded damper upstream to keep heat from coming up the cold air return.
the fan motor on my stove will keep the heated air moving into my duct work, it will have to pass through my furnace filter.My thermostat can be set to cycle the forced air system when I need it.
It will take a little trial and error, but should be worth while. I am heating an older story and a half about 1500 Sq Ft. The coal stove is in the basement. Used pellets and corn last year and cut my gas bill by 60%,so this should do much better.
I will try to borrow a digital camera and get you a picture,I am technically challenged. ( Guns,Horses,Airplanes and stoves I do OK...Computers, I struggle with!)