about 3 meters is suitable.

The general building floor is 2.9 meters high, and the dining space floor is different from the normal building floor, so it needs more space. If the dining space floor is less than 3 meters high, it will be depressed and the ventilation capacity will be affected. It is more suitable for a small restaurant to be more than 3 meters high, which can make customers feel more comfortable when eating, and is also conducive to the ventilation and air flow of the restaurant.