The woodstove at my old house had an external air intake. I believe they are required by code on new installs these days. It was a 6" metal duct if I remember correctly. The tube got very very cold near the wall and was quite hot near the stove when the fire was lit. Also I could go outside and was shocked just how much air that thing was drawing in.
In that install the tube was maybe 16" long. My new house I would love to add something similar but I have no way to get the air over to the insert.
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