... 3.Type:500/600 ISO9001/14001 Detailed Product DescriptionRoof mount ventilatorFunctions:1. It can absorb the hot air ... installation. No operational and maintenance costs.5. No roof leaking, 100% waterproof result with raining or snowing ... the aesthetic appearance of buildings7. It suits all roof types with slopes from zero to 22.5 ... 6399440Sincerity,Excellence,Supremacy and Win-Win! roof mount ventilator