Is it better to use an exhaust fan or a ventilator in a small restaurant?

It is best to use a ventilator.

The use of an exhaust fan exhausts air from one direction in the room. The use of ventilation fan can realize forced air supply in both directions.

But these two devices are not as good as fresh air ventilator. While ventilating the room, fresh air ventilator can recover most of the cold and heat in the exhaust air, which is more energy-saving.

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Xi 'an's best Xinjiang mixed noodles.

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Beg ~ ~ I'm going to visit Xiamen in the near future. Who knows what's delicious in Xiamen's hot pot? . .