... ,FN4 are air cooled heat exchangers for refrigeration system Air cooled condensers-FN-15,FN-18,FN-22,FN25are air cooled heat ... are divided in 2groups: FN, L.Air cooled condensers-FN-15,FN-18,FN-22,FN25 have been tested on 2 ... air leakage, and the system is disposed of pollution,Applicable to R22,R134a,R404A,R407C systems. FN-15,FN-18,FN-22,FN25 ...