... cooled condensers FN2,FN3,FN4 are air cooled heat exchangers for refrigeration system Air cooled condensers-FN-15,FN-18,FN-22 ... ,FN25are air cooled heat exchangers for refrigeration systemThey are divided in 2groups ... have been tested on 2.8MPa air leakage, and the system is disposed of pollution,Applicable to R22,R134a,R404A,R407C ...