The outer shell is made of thick cold rolled mild steel plates suitably reinforced with vertical channel iron frame to make the equipment mechanically very rigid.

The inner chamber is formed by ceramic fibre module suitably interlocked and tightened with stainless steel studs and cup locks. The hearth of the chamber will be made of refractory bricks to withstand concentrated heavy loads.

Double walled chamber rectangular in shape, outer made of cold rolled mile steel sheets and finished in powder coating. Inner formed by high temperature withstanding Zirconia vacuum board capable of with standing temperature up to 1450 ºC. the door is opened on top side.

The general design and construction comprises of an Outer chamber fabricated out of thick cold rolled mild steel sheets, Rectangular in shape placed horizontally with opening in the front. Refractory Muffle of required size forms the inner chamber. This is surrounded by ceramic fibre blankets on all the four sides and the rear to reduce heat losses to a minimum.