The burner has an inner lining (44) with an inlet (48) and outlet (50). Discharge holes (80) lie in predetermined patterns between its combustion (62) and cooling (64) sides, around a centroid, and preferably angled between the two sides. This angle slopes from the inlet to the outlet. There is an outer lining (46) which has intake holes (114) passing through it at 90 deg to its inner and outer surfaces (100,102). Some of these intake holes are set above the centroid of the discharge holes.
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