They need to be washed yourself.

Flothe extracts, on the contrary, bring air to the street or to the ventilation system, that is, they have an air duct. More expensive models are equipped with simple fat filters to prevent pollution of the internal surfaces of the hood itself and the air duct. They need to be washed yourself. Budget hoods can sometimes not even have such filters, which will complicate their cleaning. As already mentioned, running hoods are somewhat more productive than circulating, which is a good advantage. Hoods of this type are complex in installation due to the presence of an air duct, so installing it in the finished kitchen will be difficult. Another disadvantage in this case is not a high -quality air purification: for circulation, you will have to open a window, which sometimes may be impossible.