I'm using a pair of 405 CFM fans pushing air around/through my Channing III and it's plugged into the existing 'main trunk' of the forced air furnace. I've also tapped into the cold air returns so there's a complete 'circuit' of air...just like the furnace does. In electrical terms, my stove is in 'parallel' with the furnace, and each must be used separately, not additively.
Between air flow loss due to duct size, turns, and length of my connections, there's a noticable any air flow coming out the vents on the first floor of my cape cod style house, but it's far shy of the airflow from my furnace fan. However, it DOES work reasonably well although it's considerably slower to raise the house temps than what the gas furnace can do.
I've put a do-it-yourself back draft preventer in the main furnace duct so I am not pushing warm air towards the furnace. Also, I have manual dampers in the cold air returns and the corresponding take-offs so that the cold air return comes from the rooms, not from the existing cold air ductwork (ie, no backflow from the furnace).
I still have to do some minor re-do of the cold air ductwork to reduce the swooosshhh sound from the cold air return in the living room. That's my only problem with my installation.