some need it and some don't.

range hood is a kind of kitchen appliance for purifying the kitchen environment. It is installed above the kitchen stove, which can quickly pump away the waste burned by the stove and the oil fume harmful to human body generated in the cooking process, and discharge it outdoors, thus reducing pollution, purifying the air, and having the functions of anti-virus and anti-explosion. The range hood needs to be cleaned regularly. Simple cleaning can't get rid of oil stains. Professional cleaning agents must be used to clean the range hood. In the early days, the smoke exhaust in family kitchens was done by exhaust fans. Although the exhaust fan can remove most of the oil fume in the kitchen, it is unable to solve the pollution of the oil fume produced in cooking to the whole kitchen. The oil fume produced in cooking contains many substances harmful to human body. If people work in a room full of oil fume for a long time, it will lead to many diseases.