Ninety percent. According to official website of Guangzhou Crown Kitchen & Bathroom Co., Ltd., it can be known that the grease separation degree of Crown range hood reaches 90%, the air volume is 18 1m3/min, the nominal wind pressure is 260Pa, and the maximum static pressure is 320Pa. Crown range hood is made of high quality materials, such as stainless steel and tempered glass, which has good durability and high temperature resistance.