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I have modified several fireplaces using angle iron4”. The angle is about 3” longer than the opening. Cut 1-1/2” of 1 web on both ends. Move down to the mortar joint at the level or close to what you want. Cut the mortar out 1-1/2” deep. Slip the angle in with the cut web up and the lower longer web creating a shelf. Use refractory cement as a mortar and ...

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