a refractory brick support (10) with a metal grid (20) for receiving the refractory bricks of a hot air regenerator (2) and existing supports (40) disposed between the metal grid (20) and the bottom surface of the furnace ( 21), wherein: the support comprises additional coaxial supports (50) which are arranged coaxially outside the existing supports (40); the supplementary supports (50) have a support body (51) which is arranged coaxially outside the existing support (40) and a height adjustment mechanism (59) for adjusting the height of the support body (51); and the support body (51) has multiple support cylinders (52) which are stacked in the height direction.
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