I needed to make a new furnace, because my old one is toast. I used insulated fire brick that can withstand temperatures up to 1430c and a cement that can withstand temperatures up to 1600c. For the whole furnace I used 25 bricks and a bit more then 10kg of cement. The furnace cost me around 170 euros.
Outside dimensions
Height: 51 cm or 20''
Diameter: 37 cm or14.6''
Inside dimensions
Height: 33 cm or 13''
Diameter: 22 cm or 8.7''
Inlet hole diameter 5 cm or 2''
Outlet hole diameter 10 cm or 3.9''
Music
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Track: Evalk - Lavender Town
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Track: Triple M - 2GETHER
Link:    • Triple M - 2GETHER