... C— -25°C)1.light in weight,convenient intallation,compact structure,Rapid temperature falling,long preservation time.2.efficient fins, more ... — -25°C)1.light in weight,convenient intallation,compact structure,Rapid temperature falling,long preservation time.2.efficient fins, more ... ,rustproof.8.Defrost heat performance: 8 hours defrost cycle. Roof installation dual discharge air cooler for cold storage