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When it comes to determining the liner size for a masonry fireplace, it's just mathematics. Once you understand how the formula works then it becomes easy to size the liners. Some manufacturer's such as Duravent provide a liner sizing guide as shown in the example with the fireplace.Step 1: Find the width of the fireplace opening on the chart (look for Step 1, at right). In the example they use a 36" width. Hint: Follow the red lines in the example.Step 2: Find the height of the fireplace o …