... of fast heating (20-40mins), energy saving, high accuracy of controlling the temperature, reliable heat keeping, auto heating and cooling by programming and a ... , new material developing, machinery, fire-proof material, architecture, special material and etc. Standard Sizes of muffle furnace: Model Chamber size(WxHxDmm ... 500x500x500mm (20"x20"x20") 1700. C Box Chamber Muffle Furnace with high quality