The kitchen has six burners, how big an exhaust fan is needed, from the 2nd floor to the 11th floor

Kitchen smoke exhaust, now most of the new house decoration uses range hoods, for range hoods, the state stipulates that the index air volume value is greater than or equal to 7m3 min.

The main function of the exhaust fan is to circulate the air in the bathroom. It has nothing to do with the southeast wind, so just buy a normal one.

If it is a kitchen smoke exhaust, the exhaust fume cabinet is usually used for exhaust or fresh air system, I hope to help you, the centrifugal fan is better, and the air volume itself is OK, but the disadvantage is that the wind pressure is low, to be precise, the exhaust fume cabinet.

Generally, it is used as fuel such as gas, oil, etc., in basements or closed places above ground.

This is not necessary, there is generally a check valve at the connection between the air duct and the exhaust pipe, which actually plays a role in fire prevention.