Typical standards require a cross section area of the fireplace flue or chimney vent to be equal to 1 10 of the area of the fireplace opening itself for a conventional wood burning installation and without considering the effects of a glass fire door.
Chimney flue length.
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Chimney height also plays a role and taller chimneys generally draft better than shorter ones.
Figuring out the proper size for your chimney flue can seem like a challenge.
With that in mind the height of the chimney should be at least 15 feet from the floor of the fireplace to the top of the flue.
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Quality chimney liner material that meets astm and excels in freeze thaw environments.
For example an 8 x 8 square nominal clay chimney flue tile liner has inside dimensions of 6 3 4 x 6 3 4.
Solving your chimney s math.