What is the chimney of the મફલ ભઠ્ઠી in the university laboratory?

The chimney of the muffle furnace in university laboratories is to remove the exhaust gas released by some sintered objects. The muffle furnace chimney is also called the smoke exhaust pipe, which is generally located on the top of the muffle furnace. The chimney is connected to the furnace body by a connector. To do an ash laboratory or an assay laboratory, you need to choose an electric furnace with a chimney. The chimney of the muffle furnace should be kept open to allow the air in the furnace to circulate, and the exhaust gas flue pipe should be discharged to the outdoors or in the exhaust gas processor.

When doing the ash experiment, open the furnace body, put the sample in, make the temperature rise slowly, slowly oxidize, open the chimney to make the sample contact with the air, and accelerate the ashing.