Using the special equipment resistant even to the temperature of 1600℃, it is possible to observe and inspect the interior of the furnace.

Using the checkerscope developed by IFC, it is possible to observe and precisely control the clogging degree of checker bricks inside the furnace.

It is a method of cleaning up the clogging by dissolving the solid matter using a jet burner, which heats up the checker bricks from the lower part of the regenerator.