Air filtration in a furnace___________________?

A. Updraft kiln
B. Muffle furnace
C. Continuous furnace
D. None of these

A. Blast furnace
B. Steam boiler
C. Salt bath furnace
D. Annealing furnace

A. Glass melting furnace
B. Open hearth furnace
C. By product coke ovens
D. All A., B. and C.

A. Stoichiometric combustion air
B. Non-preheated combustion air
C. Combustion air not enriched with oxygen
D. Recuperators

A. Rotary Kiln
B. Tunnel Kiln
C. Natural draft furnace
D. Batch furnace