May I enquire as to why are you looking for a lead free residential "Fire" sprinkler head? As, Fire Sprinklers are not governed by the plumbing codes and should not be directly attached to the domestic water supply, except as allowed by NFPA 101 sec 9.7 for isolated hazardous areas. In those cases they should be separated by a lead free backflow preventer if required by the water purveyor.
The major Sprinkler manufacturers are: Tyco Fire Products, Viking Group Inc., Reliable, and Globe Fire Sprinkler Company. You can rest assured if they don't have one, there isn't one.
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