Hello, first time posting here. I recently purchased a Shelter Furncace, indoor wood forced air unit. The unit is rated for 100,000 btus, 2000 sq ft. Has a 1800 cfm fan. I installed in my garage because I have no basement, have a deep crawl. It requires 12" duct for supplly and return air. I hooked up with flexible, insulated duct, about 50' total length to where it ties into main trunk of propane furnace. Is that too long of a run? The heat output at the registers is minimal. I also get a strong wood burning smell through the register. Not happy about that, thats why I chose a add on furnace instead of a woodstove I am also thinking of doing away with the forced air and purchasing stainless water coil and a heat exchanger to put in the heat plenum. Can I get enough heat transfer with a double heat coil and a heat exchanger? I probably would need to add a storage tank of some sort, circulator pump and such. I heard its easier to move heat through water and instead of air. The house is 1600 square foot, average insualtion. Thanks for the help, just trying to get this thing going and save some money on the propane bill. I did burn a few hot fires in it prior to hooking to duct.