The frame of AC fan is Durable-cast Aluminum ,and the impeller is PBT (Thermoplastic black Ul-94-VO),There are two kind of bearing system: ball and sleeve.

Shenzhen Jianzhun Electrical Machinery Industiral Co,.LTD produces brushless DC (direct current) fan,whose outside frame and blade using PBT modified plastic PBT plus VO pole fire retardant injection mold one-off shaping.

All of designers in electronic fields which need fan to dispel the heat must determine the air flow needed to dissipate heat from a given system. A required air flow is determined by knowing the power consumption in the system and the amount of air needed to remove sufficient heat from the system to limit its rise in temperature.