Internal Quench Furnaces W.H. Kay > Products > Internal Quench Furnaces Reset Sorting Item # Image Wide Long High Manufacturer Heating Max. Temp. 4113 36" 48" 36" Surface Natural Gas 1800° F View 4107 30" 48" 30" Surface Electric 1750° F View 4106 30" 48" 30" Surface Electric 1750° F View 4114 36" 72" 36" Surface (Super 36) Natural Gas 1750° F View 4115 36" 72" 36" Surface (Super 36) Electric 1750° F View 4110 36" 48" 36" AFC (Atmosphere Furnace Company) - 1999 Natural Gas 1750F View 4104 24" 36" 18" Ipsen - 2 Zones Natural Gas 1850°F View 4103 36" 48" 36" Surface Electric 1750F View 4099 30" 48" 24" Surface Natural Gas 1750°F View 4093 30" 48" 20" Surface Combustion Natural Gas 1750°F View