Foundry chimneys are designed to go through underground or to go through the ceiling of the furnace. St-37 is manufactured from sheet metal and connected by flanges. The height and diameter of the chimney is determined by the furnace heating capacity.

Connection of underground outgoing shaft furnace is designed and manufactured rotary flange. Proportionally controlled according to the internal furnace pressure damper located in both type of chimney.

Chimney insulation is provided with insulated concrete 150-200 mm thick. Concrete AISI 310 is fixed to a Y-shaped hook.