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Fans - how to convert L10 life to MTBF

Fans - how to convert L10 life to MTBF

Fans - how to convert L10 life to MTBF

a vendor provided me with an L10 life for fans used in an air conditioning system i am interested in.  
-  the fans L10 life is 65,000 hrs.
-  there are 8 fans in this assembly.  
-  4 of the fans operate at 2,250 RPM and the other 4 are at 3,600 RPM.  
-  The vendor is claiming that the MTTF is 400,000 hrs for the fans.  
i am trying to confirm this info, but the results of my calculations are not even close.
-  the formula i used is:
MTBF = L10(HRS)*10^6 / 60 * RPM.
-  Am i using the wrong formula for this?

I would appreciate any help with this.

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