Jim Fritz wrote:I realize fans and electricity fail. Everything fails. I'm looking at ways to overcome the limits of the mass run length as well as extracting all of the heat. And, I'm looking for design reasons not to use an active exhaust. The fan may fail Isn't enough of a reason not to use it. If it were no one would be using forced air furnaces. Given nearly complete combustion and the ability to deal with condensation a quality fan costing not much more than 30 dollars should give decades of service. And the additional recovered heat would rapidly make up for the purchase price and the minor use of electricity, right?
If you could get a temperature sensor inside the burn tunnel