Castor wheel mounted cabinet is double walled with inner chamber of stainless steel and outer casing of M.S. sheet duly painted / S.S. The gap of 75mm between the outer and the inner wall is filled with special grade glass wool to prevent thermal losses. Back of the unit is fitted with air circulation fan for maintaining the temperature uniformly throughout the chamber. Heating elements of nichrome are placed in the air path and are duly insulated from the body.