Thanks all, everyone noted some valuable points, I got the difference between 
UL and FM which I list some below some of your nice points:
  UL is is a product safety testing and certification organization serving 
insurance industry and  "list" items that meet their minimum safety standards. 
NFPA requires that the equipments to be tested by a recognized organization, so 
UL listed products are accepted by NFPA. FM is a fire insurance company, when 
FM insures a project, it has to write a check when a product does not perform 
(like sprinkler failure), so FM standards are usually more than minimum. Unlike 
FM, UL is not the insured company and will not write a check if a product does 
not perform, so UL standard usually meet the minimum safety requirements. UL 
mark is enough, but if a project is going to be insured by FM, then usually FM 
approved products are needed. A UL listed product is enough for NFPA, no matter 
Chinese or American, however an American UL listed sprinkler may have better 
quality than chinese, because American manufacturers have to compete on both 
cost and quality.  Chinese manufacturers may feel
 they only have to compete on price. 
  Thanks for your kind comments, I got the point.
  Reza

   
   
  

[EMAIL PROTECTED] wrote:
  Reza:

You had it right the first time. When a product does not perform, as in a 
sprinkler failure, the insured "FM" has to write a check. Therefore they are 
more likely to look at other aspects than UL. 

Case in point, when UL is asked why they approved a product, that later failed 
to function, their PR department started cranking out crap about "industry 
standards, and consensus opinion.

Good Luck


Joe Manning



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