The design of restaurants in high-star hotels must have ventilation fans, with 2-4 depending on the room size. Generally, the number of air changes at the same time should not be less than 3 times /h, but it should be accurately calculated according to the specific area and space height.

Even the terminal coil fan system with central air conditioning can't replace the air quality and comfort of private rooms, especially the heat of dishes+heat emitted by human body+the smell of tobacco and alcohol must be discharged or fresh air in time, otherwise the air quality of private rooms will get worse and worse, and it will be distributed to the public areas of hotels through corridors, causing secondary environmental pollution.