... R134) 2. pitch of fins:5mm,8mm,10mm,12mm, 3. 5mm suit for temp of storehouse abobe-10 degree,8mm ... suit for -15- -20degree,10mm suit for above -25 degree.4. more specifition pls contact me,i will send you under ... e-mail. 5.we also supply air cooler for ammonia refrigerant.(aluminum coil aluminum fin,steel pipe ... 6. Coil and fin material is depend on clients'requirement. 3 fans air cooler