The number of natural ventilator on the roof is not determined randomly, on the contrary, many factors are considered. Ridge ventilator is standard ventilation equipment for steel structure workshops. Their number and installation location are affected by local climate reasons, building environmental conditions, plant functions, plant area, and number of people in the plant.In general, the relevant calculation formulas for roof smoke ventilators are:

1. Workshop (building) volume = length * width * height

2. Number of natural ventilators = building capacity * number of air changes per hour / air change capacity of a single natural ventilator

Note:

A. The number of natural ventilator changes per hour is determined according to the function of the building. Under normal circumstances, warehouse: 3-5 times/hour; factory and workshop: 3-8 times/hour; gymnasium: 3-8 times/hour ;Paper mill: 8-15 times/hour; electroplating factory: 12-20 times/hour;

B. Air exchange capacity of a single ventilator: Determined according to the annual wind and height in different regions.

The significance of calculating the number of natural vent on the roof:

1. Cost saving. If you just install roof vent arbitrarily, too much installation will increase the cost of the company; if too few installations, not only the basic ventilation effect of the plant will not be achieved, but the company will also find other more troublesome ventilation equipment to make up for the lack of ventilation, resulting in Increase in equipment and labor costs.

2. Make the factory building a good ecosystem, create a comfortable living environment for employees, and improve their enthusiasm for work. Reduce the possibility of employees' occupational diseases, and fulfill the obligations and responsibilities assumed by the company.