I don't have a boiler, but do have a wood furnace with a secondary heat exchanger that has 3 large tubes to collect heat from. I recently was reading on here and discovered that turbulators help to break up the "core" of the heat in the exchanger tubes. We have 2 tubes that are roughly 3.5" in diameter and a large 6" tube that runs down the center of the top of the furnace. We see very little buildup and I could place them and remove them in seconds. Can they be used to increase heat transfer on a forced air furnace? I see they are used on boilers, but I wasn't sure about any other installation. This is something that interests me. We have excellent draft so slowing down some won't be an issue. Thoughts?