Please ask me how to share an exhaust in the kitchen with only one air outlet, and how to share one

It is best not to share a flue with the range hood, unless you turn on the range hood and exhaust fan at the same time every time, otherwise no matter you turn on one alone, it will pollute another device, if the high-power range hood, there is smoke flowing back from the exhaust fan.

There are 2 ways to provide you, one is to directly punch a hole in the wall to the outside and connect the exhaust fan; The second is to still take the flue, but install a reverse valve to prevent the smoke from backing up into the room.

During the renovation!! The flue in the kitchen is for the range hood to exhaust the smoke...

If you also need to install a ventilation fan, I recommend making an air conditioning hole in the exterior wall for the exhaust fan...

This is a separate hole, and sharing is definitely not possible.

The price is not expensive, and it can be done together during the renovation.

The function is repeated, and the exhaust fan is not used directly.

If it is used at the same time, it will affect the smoking effect of the range hood.

Find someone to make a hole for dozens of pieces to solve the problem.