Standard PTC heater series (with molding Aluminum shell) is installseach kind of contour again in the outside package of insulating paperheating element foundation according to the customer actual request the aluminum outer covering If the customer has the special need, may spurt each kind of color in its surface, suitably cooperates the product outside surface. For exam- ple: Sending directly, volume sending on have the widespread application Outside presses the aluminum shell PTC heating element to have the power in a big way, the reliabilityhigh, safe, the use environment scope convenience merit and so on is broad, installs, the external dimensions specification may according to customer actual request making to order.