The N and NB chamber furnaces are especially designed for dewaxing and subsequent firing of
the ceramic form. The electrically heated models are operated below the ignition point of the
wax during dewaxing. The furnaces have a heated stainless steel drain in the bottom of the
furnace chamber, formed as a funnel with the discharge near the center of the furnace.
The drainage is made of stainless steel. The stainless steel grids in the bottom can be removed for cleaning .
To prevent draining wax from ignition, there is a tight stainless steel container under the furnace
with a removable drawer for wax collection as a safety feature. After the dewaxing process
is finished the furnace continues heating in order to sinter the molds.

Standard equipment N/WAX, electrically heated

• Chamber furnace with wide-opening swinging door
• Tmax 850 °C
• Four side heating with freely radiating heating elements on ceramic carrier tubes
• Heated drainage in floor, controlled by a separate controller up to a maximum of 00 °C, to
• reliably prevent freezing of the draining wax - Release of furnace heating only possible
• after drain temperature is reached, to prevent clogging
• Stainless steel floor pan with grid bottom for level loading
• Rugged self-supporting, vaulted arch construction
• Exhaust gas vent in furnace ceiling for connection with ductwork (starting with N 440 manual exhaust flap)
• Air inlet openings for reliable air exchange
• Double-walled furnace housing for low exterior temperatures
• Removable base included in delivery (fixed base for models N 440 and larger)
• First over-temperature limit controller which must be set below the ignition point of the wax
• and prevents the wax from igniting during dewaxing. It is customers responsibility to set the
• required time interwal for dewaxing. After this time has elapsed the over-temperature limit
• controller will be deactivated to make sure that the furnace can continue with the sintering process.
• Second over-temperature limit controller with manual reset for thermal protection class 2 in
• accordance with EN 60519-2 as temperature limiter to protect the furnace and load

These furnaces can be operated above the flash point of wax without further safety equipment.
They are used if large amounts of wax have to be molten or the wax flash point is unknown.
The molten wax drains off in a stainless steel container through an outlet in the furnace bottom.
Additionally, a part of the wax is already vaporized inside the furnace.

Standard equipment NB/WAX, directly gas-fired

• Features like N../WAX, except:
• Furnace volumes 660 liters and 1000 liters
• Directly gas-fired using fan burners with fully automatic temperature regulation
• Gas fittings with safety system
• Automatic ignition with monitor
• Gas types: city gas, natural gas, or propane gas
• Special positioning of the gas burner for optimum temperature uniformity
• Exhaust hood with exit connection 150 mm

Additional equipment for N and NB

• Catalytic or thermal afterburning systems