Ventilation times of fresh air system in banquet hall

The banquet hall covers an area of less than 1 square meters, and it is ventilated 6 times per hour; The area is between 1 and 2 square meters, and the ventilation is changed 8 times per hour. Specifically, the number of air changes in the fresh air system of the banquet hall is related to the size of the banquet hall. If the area of the banquet hall is less than 1 square meters, it is necessary to exhaust air at least 6 times per hour, so as to ensure indoor air circulation; If the area is between 1-2 square meters, it needs to be ventilated 8 times per hour to ensure air circulation; If the area exceeds 2 square meters, it needs to be ventilated more than 1 times per hour. Because of the larger space, more air changes are needed to ensure the normal indoor air circulation.