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Never put too much of these materials near the burner holes. The gas must pass through the burner easily. CAUTION : Blocking gas ports with vermiculite or lava rock will result in poor light-up performance and delayed ignition. 3. Place five or six pieces of rock wool fiber approximately 1" large on top of the front gas ports. Place two or three pieces over each of the back gas ports. Make sure not to put too many pieces as this could result in an altered flame pattern and possible carbon deposi