How To Calculate Open Fireplace Flue Size. Back wall must slope towards front for remainder of height. Using equation 1 calculate the fireplace opening area, a.
The ideal flue size is typically determined by the exhaust outlet of the stove or appliance. Choose a fireplace design that fits in scale with the size of the yard and home. Modern central air systems can create problems for open front fireplaces.
Back wall must slope towards front for remainder of height.
All closed combustion fireplaces carry a kilowatt (kw) rating and we calculate how much area can be heated by applying a common formula used throughout the fireplace industry. I often look to the architecture of the main home for details to replicate on my fireplace. When sizing a fireplace for a square or rectangular liner the 1/10 ratio should be used. If you are installing an oval liner for a fireplace, calculate the fireplace opening in the same manner as the above formula, but instead divide by 10.