I sell all types of venting and select the best venting for the job. Chickenman also sells a brand of DT venting and he also says it increases overall efficiency 10% In the laws of thermodynamics, if the burn air temp going into the burn pot comes in at a higher temperature then a non heated OAK install that less energy is used to bring this higher temp air up to combustion temperature therefore increasing the overall efficiency. So if you did not drop out if college you may have learned that. If you are calling what you see is stupid then you may be looking in the mirror!
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