Dennis Mcgee
New Member
Hello all,
My situation is a bit backwards from most. I installed a Caddy wood furnace a few years ago. I am very happy with it, now I want to add a 90% efficient propane furnace in series with my Caddy. I have a blower box ducted to the bottom back of the unit, where the cold air return comes from above. The hot air plenum exits Caddy up of course, through solid sheet metal duct. My question is can I remove the blower box on the back of Caddy and the install a down flow gas furnace that blow hot air through the Caddy into my existing ducts. The new gas furnace would have the return on top. Of course the controls and interlock would need to be changed. Would this be safe and effective? The gas blower would have to pass hot air through the Caddy and the wood furnace would have to draw air through the gas heat exchanger.
My situation is a bit backwards from most. I installed a Caddy wood furnace a few years ago. I am very happy with it, now I want to add a 90% efficient propane furnace in series with my Caddy. I have a blower box ducted to the bottom back of the unit, where the cold air return comes from above. The hot air plenum exits Caddy up of course, through solid sheet metal duct. My question is can I remove the blower box on the back of Caddy and the install a down flow gas furnace that blow hot air through the Caddy into my existing ducts. The new gas furnace would have the return on top. Of course the controls and interlock would need to be changed. Would this be safe and effective? The gas blower would have to pass hot air through the Caddy and the wood furnace would have to draw air through the gas heat exchanger.