... foodstuff,PVC,calio printing,pharmacy.The fin tubes of model SZL Series use Φ18×2.038,Φ21× ... long as diffrent length of the tubes form different types of radiator. The floating of thermal medium can ... working temperature is under 300.The materials of SZL compound fins can be carbon steel,copper ... steel. With the use of bimetal,the tubes of radiator has the characteristic of low thermal resistance, good ...