... 40%.1 Cold room insulation material: Polyurethane, color steel, stainless steel, aluminum plate embossed to be optional..2 Cold ... with aluminum radiating fin, Outer shell is quality steel plate with plastic covering, melting frost of electro ... 14Refrigerant:R22 or others15Other auxiliary material and parts (airproof ointment, various types of steel, fasteners, rivet, consuming parts) Cold Storage