I have been challenged to design a circular fireplace as follows: approx. 6 foot diameter firepit with a metal hood for a vent. the installation will be in a lodge in South Dakota (for those of you living in the southern areas that means cold and windy). The location will be in a converted barn. My concerns are: #1 Will a fresh air supply be necessary to ensure that the draft will not pull all of the heated air from the structure? #2 What size for the hood in relation to the firepit? #3 What material to construct the flue pipe from to ensure a good draft and protect framing materials from the heat (the flue will need to be about 30 feet long). #4 Will there be any need for a power vent on the flue. and #5 Will there be a problem with smoke escaping into the room if the hood is 5-6 feet above the fire?
Obviously, this will only be used occasionally and not as a source of heat. If anyone out there has any ideas or suggestions I would appreciate the help. Thanks! Kevin Anderson.