100% safe measures
1.  Fasteners : all the fastener enjoy the application of high strength industrial bolt of 8.8 grade and the practical stress it could endure 
     is 10 times than normal
2.  Steel wire traction : every steel wire has the strength of stress at 1000kg with the joint being set up double protection.
3.  Protective structure for fan main body : safety ring,once accidents occur, the safety ring would protect any spare part from falling down.
4.  The l - type safety structure to reconnect all the flabellum and the bottom head as an integrated structure.
5.  Once accident occur the frequency controlling system would automatically alarm and stop operation.
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